Summing positive integers with triangles

This animation is based on the following source:

#manim #math #proof #visualproof #mathshorts #proofwithoutwords #sums #integers #sumformula

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[kevina]

Simplified it's the same as n(n+1)/2

[atharvyadav-uswn]

that was really easy to understand, keep it up bro

[procyon]

I always wondered about these "triangular" numbers- a triangle because of the shape you'd put bowling pins into, each row one fewer than the last.

[ethanwinchenbach]

I just love that you used Coldplay for the background music.

[temirkhansmagulov]

Really really nice. Liked it. Never thought like that

[steptimusheap]

And of course the limit as n approaches infinity is (∞^2)/2 + ∞/2 = -1/12

[gymarcelo]

could you please teach this animation software?