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 A055906 #3 Mar 30 2012 17:37:11 %S A055906 1,-1,2,-5,12,-17,-62,677,-2840,-1451,119954,-866857,472540,52538185, %T A055906 -517302474,410579683,47022181040,-542323525061,101360204230, %U A055906 74342770852033,-905627986876452,-1359339244442825,186336992053330034 %N A055906 Column 0 of triangle A055905. %K A055906 sign %O A055906 0,3 %A A055906 _Christian G. Bower_, Jun 13 2000