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 A266731 #7 Jan 04 2016 22:33:31
%S A266731 7,13,18,29,39,61,82,125
%N A266731 Smallest number of vertices in bi-regular ({3,4};n) graph with girth (shortest cycle) = n.
%Y A266731 Cf. A000066, A266730.
%K A266731 nonn,more
%O A266731 4,1
%A A266731 _N. J. A. Sloane_, Jan 04 2016