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 A207135 #10 Sep 07 2013 20:33:38
%S A207135 1,2,5,32,796,77508,26058970,28765221688,101824384364586,
%T A207135 1145306676113095172,40618070255705049577152,
%U A207135 4523562146025746408072408406,1576501611479138389748204925102907,1714649258669533421310212170714443813118
%N A207135 G.f.: exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, k*(n-k)) ).
%C A207135 The logarithmic derivative yields A207136.
%C A207135 Equals the row sums of triangle A228900.
%C A207135 Equals the self-convolution of A228852.
%e A207135 G.f.: A(x) = 1 + 2*x + 5*x^2 + 32*x^3 + 796*x^4 + 77508*x^5 +...
%e A207135 where the logarithm of the g.f. equals the l.g.f. of A207136:
%e A207135 log(A(x)) = 2*x + 6*x^2/2 + 74*x^3/3 + 2942*x^4/4 + 379502*x^5/5 +...
%o A207135 (PARI) {a(n)=polcoeff(exp(sum(m=1,n,x^m/m*sum(k=0,m,binomial(m^2,k*(m-k))))+x*O(x^n)),n)}
%o A207135 for(n=0,20,print1(a(n),", "))
%Y A207135 Cf. A207136 (log), A167006, A228900, A206830, A206850, A228852.
%K A207135 nonn
%O A207135 0,2
%A A207135 _Paul D. Hanna_, Feb 15 2012