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 A308885 #4 Jul 01 2019 22:40:39 %S A308885 0,1,2,3,20,25,30,35,36,37,40,41,42,47,48,49,54,55,56,63,65,70,79,88, %T A308885 94,95,110,112,114,115,121,123,125,126,132,134,137,138,141,143,144, %U A308885 145,147,149,150,152,154,155,156,162,165,167,168,169,175,178,180,181,182,195,197 %N A308885 Positions of 0's on the spiral defined in A308884. %Y A308885 Cf. A308884-A308895. %K A308885 nonn %O A308885 1,3 %A A308885 _N. J. A. Sloane_, Jul 01 2019