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 A094956 #2 Apr 30 2014 01:30:10 %S A094956 1,3,19,169,1926,26839,442961,8459361,183642229,4468927451, %T A094956 120540804396,3570537526921,115246129602241,4026668668065135, %U A094956 151435858582831951,6100080207560938369,262054579034061036018 %N A094956 Diagonal T(n+2,n) of array A094954. %K A094956 nonn %O A094956 1,2 %A A094956 _Ralf Stephan_, May 31 2004