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 A074706 #3 May 10 2013 12:45:05
%S A074706 1,1,3,22,272,5476,153172,6027960,300059328,19521660672,1516955215104,
%T A074706 147672608429952,16485184277455104,2248301164177656576,
%U A074706 340306578491544509184,62081853548770370612736
%N A074706 1/(1+Sum_{n>0} (-x)^n/n^2) = Sum_{n>=0} a(n)*x^n/n!^2.
%K A074706 nonn
%O A074706 0,3
%A A074706 _Vladeta Jovovic_, Sep 04 2002