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 A243564 #12 Jun 27 2014 15:09:48 %S A243564 1,1,1,1,1,4,3,3,2,18 %N A243564 Number of simple connected graphs with n nodes that are integral and have no subgraph isomorphic to diamond graph. %H A243564 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %Y A243564 Cf. A242790 (diamond free graphs), A064731 (integral graphs). %K A243564 nonn,more %O A243564 1,6 %A A243564 _Travis Hoppe_ and _Anna Petrone_, Jun 06 2014