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 A135474 #7 Feb 21 2013 15:16:49 %S A135474 1,3,9,36,285,1908,21630,197328,2113911,23814810,294557142,3893052636, %T A135474 55457566905 %N A135474 A071605(n)/(n-1)!. %Y A135474 Cf. A071605, A040175. %K A135474 nonn,more,hard %O A135474 1,2 %A A135474 _N. J. A. Sloane_, Feb 08 2008 %E A135474 a(10)-a(13) from _Stephen A. Silver_, Feb 21 2013