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%I #4 Apr 30 2014 01:27:34
%S 1,2,4,11,41,195,1130,7716,60599,537676,5316162,57940107,689965123,
%T 8911606493,124072525780,1852176280208,29510747957549,499830538998126,
%U 8967438954008720,169881509587167555
%N Antidiagonal sums of array A007754.
%t a[0] = 1; a[1] = 2; a[n_]/;n>=2 := a[n] = n a[n-1] - a[n-2] + 1; Table[a[n],{n,0,15}] - _David Callan_, Jul 22 2008
%K nonn
%O 0,2
%A _Ralf Stephan_, Nov 06 2004