%I #2 Mar 30 2012 18:59:13
%S 1,2,1,0,0,1,3,2,0,1,0,0,0,0,1,0,0,2,0,0,1,0,0,0,0,0,0,1,4,3,0,2,0,0,
%T 0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,2,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,
%U 3,0,0,2,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2,0,0,0,0,0,0,1
%N ((1,x)-(x,x^2))^(-2) (using Riordan array notation).
%C Square of number triangle A115361. Row sums are A115364.
%e Triangle begins
%e 1,
%e 2, 1,
%e 0, 0, 1,
%e 3, 2, 0, 1,
%e 0, 0, 0, 0, 1,
%e 0, 0, 2, 0, 0, 1,
%e 0, 0, 0, 0, 0, 0, 1,
%e 4, 3, 0, 2, 0, 0, 0, 1,
%e 0, 0, 0, 0, 0, 0, 0, 0, 1,
%e 0, 0, 0, 0, 2, 0, 0, 0, 0, 1,
%e 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
%e 0, 0, 3, 0, 0, 2, 0, 0, 0, 0, 0, 1,
%K nonn,tabl
%O 0,2
%A _Paul Barry_, Jan 21 2006