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 A115087 #3 Mar 30 2012 18:36:55 %S A115087 1,2,5,21,102,579,3601,24426,176858,1359906,10996740,93136545, %T A115087 821734072,7529402477,71404315785,699210393923,7053151126260, %U A115087 73158494370744,778922147312076,8500606925203992,94961268583354364,1084632255967292304 %N A115087 Column 1 of triangle A115085. %Y A115087 Cf. A115085, A115086 (column 0), A115088 (column 2), A115089 (row sums); A115082. %K A115087 nonn %O A115087 0,2 %A A115087 _Paul D. Hanna_, Jan 13 2006