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 A023640 #10 Sep 18 2018 13:51:03 %S A023640 1,2,4,13,6,27,24,47,18,167,29,79,105 %N A023640 Number of vertex-transitive graphs of valency 5 with 2n nodes. %D A023640 CRC Handbook of Combinatorial Designs, 1996, p. 649. %Y A023640 Even-indexed terms of column k=5 of A319367. %K A023640 nonn,more %O A023640 3,2 %A A023640 _N. J. A. Sloane_