%I #2 Mar 30 2012 18:59:26
%S 1,0,1,1,3,8,25,84,301,1139,4528,18849,81968,371622,1753164,8589608,
%T 43624741,229255133,1244544545,6968765313,40195073827,238527741350,
%U 1454722738679,9108812009826,58503226812174,385086101416594
%N Diagonal sums of number triangle A172380.
%C a(n+2) gives the diagonal sums of A172381.
%K nonn
%O 0,5
%A _Paul Barry_, Feb 01 2010