A115363 ((1,x)-(x,x^2))^(-2) (using Riordan array notation).

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, 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, 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

Offset: 0

Author

Paul Barry, Jan 21 2006

Keywords

• nonn
• tabl

Comments

Square of number triangle A115361. Row sums are A115364.

Examples

			Triangle begins
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, 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, 3, 0, 0, 2, 0, 0, 0, 0, 0, 1,