This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A368128 #12 Jan 07 2024 14:07:36 %S A368128 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, %T A368128 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, %U A368128 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 %N 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. %H A368128 Hugo Pfoertner, <a href="/A368128/b368128.txt">Table of n, a(n) for n = 0..3000</a> %H A368128 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %o A368128 (PARI) \\ Identical to a368127(n), but with %o A368128 a368128(n) = BijectionD([ax(n), ay(n)], Bijectionk)[2]; %Y A368128 A368127 gives the corresponding x-coordinates. %Y A368128 Cf. A367150, A368126. %K A368128 sign %O A368128 0,12 %A A368128 _Hugo Pfoertner_, Jan 07 2024