A368128 - OEIS

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A368128

a(n) is the y-coordinate of the n-th point in a square spiral mapped to a square grid rotated by Pi/4 using the symmetrized variant of the distance-limited strip bijection described in A368126.

0, 1, 1, 1, 0, -1, -1, -1, 0, 0, 1, 2, 3, 2, 2, 1, 0, 0, -1, -2, -3, -2, -2, -1, 0, 1, 2, 2, 3, 3, 4, 3, 3, 2, 2, 1, 0, -1, -2, -2, -3, -3, -4, -3, -3, -2, -2, -1, 0, 1, 1, 2, 3, 4, 4, 5, 6, 5, 4, 4, 3, 2, 1, 0, 0, -1, -1, -2, -3, -4, -4, -5, -6, -5, -4, -4, -3, -2, -1, 0, 0, 1, 2, 2, 3, 4

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,12

LINKS

Hugo Pfoertner, Table of n, a(n) for n = 0..3000

Index entries for sequences related to coordinates of 2D curves

PROG

(PARI) \\ Identical to a368127(n), but with

a368128(n) = BijectionD([ax(n), ay(n)], Bijectionk)[2];

CROSSREFS

A368127 gives the corresponding x-coordinates.

Cf. A367150, A368126.