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 A125787 #3 Mar 30 2012 18:37:02 %S A125787 1,2,8,52,433,4276,58017,855463,13670443,235745794,5122022952, %T A125787 115172651558,2700441900575,66188170219650,1696382503295129, %U A125787 52131050479431445,1631282413260019671,52321326819923379190 %N A125787 Main diagonal of table A125781. %Y A125787 Cf. A125781, A125788. %K A125787 nonn %O A125787 0,2 %A A125787 _Paul D. Hanna_, Dec 09 2006