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 A203757 #5 Mar 30 2012 18:58:07 %S A203757 1,68,71586,376922368,6239545856900,251494987671668736, %T A203757 20987341985386639351048,3241523366830203280698638336, %U A203757 853542446596053545575191471030288,359842245522349912325804490637312000000 %N A203757 Square root of v(2n)/v(2n-1), where v=A203755. %C A203757 See A203755. %t A203757 (See A203755.) %K A203757 nonn %O A203757 1,2 %A A203757 _Clark Kimberling_, Jan 05 2012