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#GenerativeArt interlude

More fun with OEIS integer sequences.

Today we'll make some pseudospirals: a sequence of arcs with 90 degree turns in between, where the radii are driven off a sequence. Arcs may have a gain function applied. Negative radii flip direction.

A200437: Number of -n..n arrays x(0..9) of 10 elements with zero sum and no two or three adjacent elements summing to zero
Sequence negation (every 17th), no gain