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 A121146 #3 Mar 30 2012 16:50:30 %S A121146 1,4,16,84,465,2714,15732,90934,520105 %N A121146 Numbers of isomers of unbranched a-4-catapolyoctagons - see Brunvoll reference for precise definition. %D A121146 J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13. %K A121146 nonn %O A121146 2,2 %A A121146 _N. J. A. Sloane_, Aug 13 2006