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APL, 5

⍪⍳¨⍳⎕

creates a vector 1..n and for each element another such vector.

Then ⍪ makes a column out of all vectors. This avoids the problem with trailing blanks.

Try it on tryapl.org

Older solution:

{⎕←⍳⍵}¨⍳⎕

Creates a vector 1..n

{⎕←⍳⍵} is a function that outputs for each (¨) element a vector 1..n on a separate line

This one can't be tried on tryapl.org unfortunately, because ⎕← doesn't work there.

APL, 5

⍪⍳¨⍳⎕

creates a vector 1..n and for each element another such vector.

Then ⍪ makes a column out of all vectors. This avoids the problem with trailing blanks.

Try it on tryapl.org

Older solution:

{⎕←⍳⍵}¨⍳⎕

Creates a vector 1..n

{⎕←⍳⍵} is a function that outputs for each (¨) element a vector 1..n on a separate line

This one can't be tried on tryapl.org unfortunately, because ⎕← doesn't work there.

APL 10 9

{⎕←⍳⍵}¨⍳⎕

Creates a vector 1..n

{⎕←⍳⍵} is a function that outputs for each (¨) element a vector 1..n on a separate line

This one can't be tried on tryapl.org unfortunately, because ⎕← doesn't work there.

APL, 5

⍪⍳¨⍳⎕

creates a vector 1..n and for each element another such vector.

Then ⍪ makes a column out of all vectors. This avoids the problem with trailing blanks.

Try it on tryapl.org

Older solution:

{⎕←⍳⍵}¨⍳⎕

Creates a vector 1..n

{⎕←⍳⍵} is a function that outputs for each (¨) element a vector 1..n on a separate line

This one can't be tried on tryapl.org unfortunately, because ⎕← doesn't work there.

APL 7

↑⍕∘⍳¨⍳⎕

Creates a vector 1..n

then for each element another such vector.

⍕ formats the content of the vector so it's now a string.

↑ finally creates a matrix.

Try it on tryapl.org

APL 10 9

{⎕←⍳⍵}¨⍳⎕

Creates a vector 1..n

{⎕←⍳⍵} is a function that outputs for each (¨) element a vector 1..n on a separate line

This one can't be tried on tryapl.org unfortunately, because ⎕← doesn't work there.