A132048 3*A007318 - A103451 - A000012.

1, 1, 1, 1, 5, 1, 1, 8, 8, 1, 1, 11, 17, 11, 1, 1, 14, 29, 29, 14, 1, 1, 17, 44, 59, 44, 17, 1, 1, 20, 62, 104, 104, 62, 20, 1, 1, 23, 83, 167, 209, 167, 83, 23, 1, 1, 26, 107, 251, 377, 377, 251, 107, 26, 1

Offset: 0

Author

Gary W. Adamson, Aug 08 2007

Keywords

• nonn
• tabl

Comments

Row sums = A077802: (1, 2, 7, 18, 41, 88, ...).

Examples

			First few rows of the triangle:
  1;
  1,  1;
  1,  5,  1;
  1,  8,  8,  1;
  1, 11, 17, 11,  1;
  1, 14, 29, 29, 14,  1;
  1, 17, 44, 59, 44, 17,  1;
  ...
		

Crossrefs

Cf. A007318, A103451, A000012, A077802.

Formula

3*A007318 - A103451 - A000012 as infinite lower triangular matrices.