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%I #4 Mar 30 2012 18:37:38
%S 1,3,347,10707908,72078431500368,103279205595241909409817,
%T 32276238007289208146779304321387283,
%U 2246642168097747174860193404728752903216792387572,35410884110668229233891981980646482609768612036854978171150794831
%N Central terms of triangle A209424.
%o (PARI) {a(n)=polcoeff(polcoeff(exp(sum(m=1,2*n,x^m/m*sum(k=0,m,binomial(m,k)^m*y^k))+x*O(x^(2*n))),2*n,x),n,y))}
%o for(n=0,10,print1(a(n),", "))
%Y Cf. A209424, A209425.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Mar 08 2012
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