#Japt -Rx, 20 18 bytes The second line includes a trailing tab.

Nc¡=ä+
Ëq' ² iEç'  

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##Explanation :Implicit input of array U N :The array of inputs (NOT the input array) c :Concatenate ¡ : Map U ä+ : Consecutive sums of U = : Reassign to U for next iteration \n :Reassign the resulting 2D-array to U Ë :Map each array at index E q : Join with '\t : Tab ² : Repeated twice i : Prepend '\t : Tab ç : Repeated E : E times :Implicitly join with newlines, trim (not strictly necessary) and output.

Japt -Rx, 20 18 bytes

The second line includes a trailing tab.

Nc¡=ä+
Ëq' ² iEç'  

Try it

Explanation

                  :Implicit input of array U
N                 :The array of inputs (NOT the input array)
 c                :Concatenate
  ¡               :  Map U
    ä+            :    Consecutive sums of U
   =              :    Reassign to U for next iteration
\n                :Reassign the resulting 2D-array to U
Ë                 :Map each array at index E
 q                :  Join with
  '\t             :   Tab
     ²            :   Repeated twice
       i          :  Prepend
          '\t     :   Tab
         ç        :   Repeated
        E         :   E times
                  :Implicitly join with newlines, trim (not strictly necessary) and output.

#Japt -Rx, 20 18 bytes Nc¡=ä+ Ëq' ² iEç'

Try it

##Explanation :Implicit input of array U N :The array of inputs (NOT the input array) c :Concatenate ¡ : Map U ä+ : Consecutive sums of U = : Reassign to U for next iteration \n :Reassign the result 2D-array to U Ë :Map each array at index E q : Join with '\t : Tab ² : Repeated twice i : Prepend '\t : Tab ç : Repeated E : E times :Implicitly join with newlines, trim (not strictly necessary) and output.

#Japt -Rx, 20 18 bytes The second line includes a trailing tab.

Nc¡=ä+
Ëq' ² iEç'  

Try it

##Explanation :Implicit input of array U N :The array of inputs (NOT the input array) c :Concatenate ¡ : Map U ä+ : Consecutive sums of U = : Reassign to U for next iteration \n :Reassign the resulting 2D-array to U Ë :Map each array at index E q : Join with '\t : Tab ² : Repeated twice i : Prepend '\t : Tab ç : Repeated E : E times :Implicitly join with newlines, trim (not strictly necessary) and output.

#Japt -Rx, 20 18 bytes Nc¡=ä+ Ëq' ² iEç'

Try it (Note: uses spaces for now as my phone's keyboard doesn't have a tab key! Will update with tabs, and an explanation, when I get back to a computer.)

#Japt -Rx, 20 18 bytes Nc¡=ä+ Ëq' ² iEç'

Try it

##Explanation :Implicit input of array U N :The array of inputs (NOT the input array) c :Concatenate ¡ : Map U ä+ : Consecutive sums of U = : Reassign to U for next iteration \n :Reassign the result 2D-array to U Ë :Map each array at index E q : Join with '\t : Tab ² : Repeated twice i : Prepend '\t : Tab ç : Repeated E : E times :Implicitly join with newlines, trim (not strictly necessary) and output.