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 A030789 #14 Feb 12 2023 06:03:11 %S A030789 1,2,3,4,5,6,8,9,11,12,15,17,19,20,22,26,29,31,33,36,38,40,44,48,51, %T A030789 53,57,59,63 %N A030789 Duplicate of A030749. %Y A030789 Cf. A030749. [From _R. J. Mathar_, Oct 23 2008] %K A030789 dead %O A030789 1,2 %A A030789 _Clark Kimberling_