cp's OEIS Frontend

A368123 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 A368121.

%I A368123 #13 Jan 07 2024 14:07:46
%S A368123 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 A368123 4,3,3,2,2,1,0,-1,-2,-2,-3,-3,-4,-3,-3,-2,-2,-1,0,0,1,2,3,4,4,5,6,5,4,
%U A368123 4,3,2,1,1,0,0,-1,-2,-3,-4,-4,-5,-6,-5,-4,-4,-3,-2,-1,-1,0,1,1,2,3,3
%N A368123 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 A368121.
%H A368123 Hugo Pfoertner, <a href="/A368123/b368123.txt">Table of n, a(n) for n = 0..3000</a>
%H A368123 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a>
%o A368123 (PARI) \\ Identical to a368122(n), but with
%o A368123 a368123(n) = BijectionD([ax(n), ay(n)],BijectionK)[2];
%Y A368123 A368122 gives the corresponding x-coordinates.
%Y A368123 Cf. A367150, A368121.
%K A368123 sign
%O A368123 0,12
%A A368123 _Hugo Pfoertner_, Jan 06 2024