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 A102231 #4 Mar 30 2012 18:36:44
%S A102231 0,1,5,32,236,1896,16116,142544,1298524,12100952,114820964,1105574400,
%T A102231 10775285836,106098789832,1053858546516,10546951101360,
%U A102231 106249238782652,1076554249491640,10964085715303620,112175072002688480
%N A102231 Column 1 of triangle A102230 and equals the convolution of A032349 with A032349 shift right.
%o A102231 (PARI) {a(n)=local(B=vector(n+1,k,if(k==1,1, sum(i=0,k-2,2^(i+1)*binomial(2*k-2,i)*binomial(k-1,i+1))/(k-1)))); return(polcoeff(Ser(B)^2+x*Ser(B)^4+x*O(x^n),n))}
%Y A102231 Cf. A032349, A102230.
%K A102231 nonn
%O A102231 0,3
%A A102231 _Paul D. Hanna_, Jan 01 2005