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 A023647 #9 Sep 18 2018 12:54:03 %S A023647 1,1,1,3,3,4,2,11,3,6,8,16,4,16,4,28,11,11,5,74,9,16,16,34,7,52,7 %N A023647 Number of vertex-transitive graphs of valency 4 with n nodes. %D A023647 CRC Handbook of Combinatorial Designs, 1996, p. 649. %Y A023647 Column k=4 of A319367. %K A023647 nonn,more %O A023647 5,4 %A A023647 _N. J. A. Sloane_ %E A023647 a(27)-a(31) added by _Andrew Howroyd_, Sep 18 2018