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 A186268 #4 Mar 30 2012 18:53:10 %S A186268 1,2,10,64,442,3166,23164,171884,1288404,9731818,73951550,564689040, %T A186268 4329242164,33302459936,256913334792,1986880768892,15399049701698 %N A186268 Central coefficients of A175105. %K A186268 nonn %O A186268 1,2 %A A186268 _Mats Granvik_, Feb 16 2011