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%I #3 Mar 30 2012 18:59:07
%S 1,1,2,3,8,26,107,492,2481,13599,81288,531343,3790344,29279668,
%T 242278645,2125160800,19608039385,189437263949,1912477987102,
%U 20161911603747,221869317899264,2546362514225134,30430660439311103
%N Diagonal sums of A103209, viewed as number triangle.
%F a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(n-2k+j, 2j)*k^j*C(k)}}, C(n) given by A000108.
%K easy,nonn
%O 0,3
%A _Paul Barry_, May 21 2005
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