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 A023639 #6 Jul 08 2025 17:20:01 %S A023639 1,1,3,7,4,24,10,115,48,94,42,2064,104,523 %N A023639 Vertex-transitive graphs of valency 12 with n nodes. %D A023639 CRC Handbook of Combinatorial Designs, 1996, p. 649. %K A023639 nonn %O A023639 13,3 %A A023639 _N. J. A. Sloane_