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 A124862 #3 Mar 30 2012 18:59:18 %S A124862 1,6,66,860,11970,172116,2523444,37487736,562303170,8496977060, %T A124862 129153866556,1972531074696,30245473774516,465314970745800, %U A124862 7179145222818600,111037445957810160,1721080411744977090 %N A124862 a(n)=J(2n+1)*C(2n,n), J(n)=A001045(n). %C A124862 Central coefficients of number triangle A124860. %K A124862 easy,nonn %O A124862 0,2 %A A124862 _Paul Barry_, Nov 10 2006