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 A125861 #3 Mar 30 2012 18:37:02 %S A125861 1,2,12,178,5990,435801,66593821,20997402098,13512727916532, %T A125861 17629371074833300,46432767742317108086,246240366959004185679198, %U A125861 2624854986865673643625591411,56179604057909797695704800461149 %N A125861 Main diagonal of table A125860. %Y A125861 Cf. A125860; A097712; columns: A016121, A125862, A125863, A125864, A125865; A125859 (antidiagonal sums). %K A125861 nonn %O A125861 0,2 %A A125861 _Paul D. Hanna_, Dec 13 2006