%I #3 Mar 30 2012 18:37:02
%S 1,3,12,69,612,8853,217041,9245253,695682342,93580638024,
%T 22713677612832,10025101876435413,8100572528598910191,
%U 12054728928174188426943,33214476295395054879355617,170255688895444623691322464599
%N Column 2 of table A125860; also equals row sums of matrix power A097712^2.
%C Equals column 0 of matrix power A097712^3, where triangle A097712 satisfies recurrence: A097712(n,k) = A097712(n-1,k) + [A097712^2](n-1,k-1).
%Y Cf. A125860; A097712; other columns: A016121, A125863, A125864, A125865; A125861 (diagonal), A125859 (antidiagonal sums).
%K nonn
%O 0,2
%A _Paul D. Hanna_, Dec 13 2006