block by Kcnarf bab49f708c556fbf3d1dd4be2f20e333

Vis. variations on Recamán sequence

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This block displays some visual variations on the Recamán sequence. Inspiration comes from the Numberphile‘s video The Slightly Spooky Recamán Sequence.

Here is how the Recamán sequence is computed :

a(0) = 0;
for n > 0:
    a(n) = a(n-1) - n if positive and not already in the sequence,
    a(n) = a(n-1) + n otherwise

Technically speaking, this block allows me to experiment path animation with CSS.

Acknowledgments to :