A128715 A131830 + A103451 - A000012 as infinite lower triangular matrices.

1, 2, 2, 3, 1, 3, 4, 2, 2, 4, 5, 3, 5, 3, 5, 6, 4, 9, 9, 4, 6, 7, 5, 14, 19, 14, 5, 7, 8, 6, 20, 34, 34, 20, 6, 8, 9, 7, 27, 55, 69, 55, 27, 7, 9, 10, 8, 35, 83, 125, 125, 83, 35, 8, 10

Offset: 0

Author

Gary W. Adamson, Aug 09 2007

Keywords

• nonn
• tabl

Comments

Row sums are (apart from the first row) given by A005126.

Examples

			First few rows of the triangle are:
1;
2, 2;
3, 1, 3;
4, 2, 2, 4;
5, 3, 5, 3, 5;
6, 4, 9, 9, 4, 6;
7, 5, 14, 19, 14, 5, 7;
8, 6, 20, 34, 34, 20, 6, 8;
9, 7, 27, 55, 69, 55, 27, 7, 9;
...
		

Crossrefs

Cf. A131830, A103451, A000012, A005126.