A131228 3*A051340 - 2*A128174.

1, 3, 4, 1, 3, 7, 3, 1, 3, 10, 1, 3, 1, 3, 13, 3, 1, 3, 1, 3, 16, 1, 3, 1, 3, 1, 3, 19, 3, 1, 3, 1, 3, 1, 3, 22, 1, 3, 1, 3, 1, 3, 25, 3, 1, 3, 1, 3, 1, 3, 1, 3, 28

Offset: 0

Author

Gary W. Adamson, Jun 20 2007

Keywords

• nonn

Comments

Row sums = A131229.

Examples

			First few rows of the triangle are:
1;
3, 4;
1, 3, 7;
3, 1, 3, 10;
1, 3, 1, 3, 13;
...
		

Crossrefs

Cf. A051340, A128174, A131229, A131227.

Formula

3*A051340 - 2*A128174 as infinite lower triangular matrices.