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Diagonal sums of number triangle A172380.
2

%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