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 A344012 #3 Jun 09 2021 16:43:03 %S A344012 4,8,14,21,29,41,51,65,85,99,121,135,163,182,211,229,255,291,313,351, %T A344012 389,423,461,507,543,571,627,673,721,781 %N A344012 Column 3 of array in A344009. %Y A344012 Cf. A000960, A100287, A344009. %K A344012 nonn,more %O A344012 1,1 %A A344012 _N. J. A. Sloane_, Jun 09 2021