#Japt, 16 12 bytes
@ZÔ¯V x}hVÆ1
@ZÔ¯V x}hVÆ1 :Implicit input of integers U=X & V=N
VÆ1 :Map the range [0,V) returning 1 for each element
h :Push the result of the following to the array and repeat until its length equals U
@ : Pass the array through the following function as Z
ZÔ : Reverse Z
¯V : Slice to the Vth element
x : Reduce by addition
} : End function