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%I #4 Mar 30 2012 18:37:26
%S 1,2,6,29,202,1880,22108,315784,5322126,103541022,2285965792,
%T 56501970700,1546339364952,46433615292128,1518172222889000,
%U 53695946069029290,2042960241832903824,83207255745283689726
%N A diagonal of triangle A187005.
%C Definition of triangle: A187005(n,k) = [y^k] R_{n-1}(y+y^2) for k=1..n where R_n(y) is the n-th row polynomial for n>1 with R_1(y)=y.
%o (PARI) {a(n)=local(Rn=y);for(m=1,n+1,Rn=subst(truncate(Rn),y,y+y^2+y*O(y^m)));polcoeff(Rn,n,y)}
%Y Cf. A187005, A135081, A187007, A187008, A187009.
%K nonn
%O 1,2
%A _Paul D. Hanna_, Mar 02 2011
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