%I #3 Mar 30 2012 18:59:07
%S 1,2,5,15,54,228,1106,6069,37212,252287,1873928,15127191,131788320,
%T 1231650843,12283477562,130137706957,1458823402224,17242265101407,
%U 214202486482516,2789239633559763,37974772474452740,539356744121554370
%N Row sums of A107111, viewed as a number triangle.
%F a(n)=sum{k=0..n, sum{j=0..k, binomial((n-k)(k+1), k-j)*binomial(k+j, j)}/(k+1)}
%K easy,nonn
%O 0,2
%A _Paul Barry_, May 12 2005