A131767 2*A007318 - A065941.

1, 1, 1, 1, 3, 1, 1, 5, 4, 1, 1, 7, 9, 6, 1, 1, 9, 16, 17, 7, 1, 1, 11, 25, 36, 24, 9, 1, 1, 13, 36, 65, 60, 36, 10, 1, 1, 15, 49, 106, 125, 102, 46, 12, 1, 1, 17, 64, 161, 231, 237, 148, 62, 13, 1

Offset: 0

Author

Gary W. Adamson, Jul 13 2007

Keywords

• nonn
• tabl

Examples

			First few rows of the triangle are:
1;
1, 1;
1, 3, 1;
1, 5, 4, 1;
1, 7, 9, 6, 1;
1, 9, 16, 17, 7, 1;
1, 11, 25, 36, 24, 9, 1;
...
		

Crossrefs

Cf. A007318, A065941, A027934 (row sums).

Formula

2*A007318 - A065941 as infinite lower triangular matrices.