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 A023646 #13 Sep 18 2018 13:44:03 %S A023646 1,2,3,3,7,3,7,7,11,3,20,5,10,15 %N A023646 Number of vertex-transitive graphs of valency 3 with 2n nodes. %D A023646 CRC Handbook of Combinatorial Designs, 1996, p. 649. %Y A023646 Even-indexed terms of column k=3 of A319367. %K A023646 nonn,more %O A023646 2,2 %A A023646 _N. J. A. Sloane_ %E A023646 a(14)-a(15) added by _Andrew Howroyd_, Sep 18 2018