A107704 - OEIS

%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