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 A342563 #11 May 02 2021 05:29:46 %S A342563 0,-1,0,0,0,0,1,-1,-1,-1,-1,0,0,0,0,1,1,1,1,-1,-1,-1,-1,1,1,1,1,-2,0, %T A342563 0,0,0,2,-2,-2,-2,-2,-1,-1,-1,-1,0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,-2, %U A342563 -2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1,1,2,2,2,2,-2,-2,-2,-2,0,0,0,0,2,2,2,2 %N A342563 List points (x,y,z) having integer coordinates, sorted first by R=x^2+y^2+z^2 and in case of ties, then by z and last by polar angle 0 <= phi < 2*Pi in a polar coordinate system. Sequence gives z-coordinates. %H A342563 Hugo Pfoertner, <a href="/A342563/b342563.txt">Table of n, a(n) for n = 0..10130</a> %e A342563 See A342561. %o A342563 (PARI) A342563_vec=concat([[P[3] | P<-shell(n)] | n<-[0..7]]) \\ See A342561 for shell(). - _M. F. Hasler_, Apr 27 2021 %Y A342563 Cf. A305575, A305576, A342561 (x-coordinates), A342562 (y-coordinates). %Y A342563 Cf. A343630, A343640. %K A342563 sign %O A342563 0,28 %A A342563 _Hugo Pfoertner_, Apr 27 2021