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 A125788 #3 Mar 30 2012 18:37:02 %S A125788 1,3,14,91,739,8200,103545,1454823,22446667,434412701,8858524146, %T A125788 190620224636,4325312221672,103324196180719,2949714706867857, %U A125788 86423553562234994,2610476419197591903,81455201815035815833 %N A125788 A diagonal of table A125781: a(n) = A125781(n,n+1). %Y A125788 Cf. A125781, A125787. %K A125788 nonn %O A125788 0,2 %A A125788 _Paul D. Hanna_, Dec 09 2006