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 A167686 #2 Mar 30 2012 18:59:26 %S A167686 1,-1,-1,-1,1,-1,-1,0,1,-1,0,1,1,0,0,-1,1,0,0,1,1,0,0,0,1,-1,0,0,0,-1, %T A167686 -1,0,0,0,0,-1,1,0,0,0,0,-1,-1,0,0,0,0,0,1,-1,0,0,0,0,0,1,1,0,0,0,0,0, %U A167686 0,-1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,1,-1,0,0,0,0,0,0,0,-1,-1,0,0,0,0,0 %N A167686 Hankel transform of A003823. %Y A167686 Cf. A167683. %K A167686 easy,sign %O A167686 0,1 %A A167686 _Paul Barry_, Nov 09 2009