A134545 A051731 * A004736.

1, 3, 1, 4, 2, 1, 7, 4, 2, 1, 6, 4, 3, 2, 1, 12, 8, 5, 3, 2, 1, 8, 6, 5, 4, 3, 2, 1, 15, 11, 8, 6, 4, 3, 2, 1, 13, 10, 8, 6, 5, 4, 3, 2, 1, 18, 14, 11, 9, 7, 5, 4, 3, 2, 1

Offset: 1

Author

Gary W. Adamson, Oct 31 2007

Keywords

• nonn
• tabl
• more

Comments

Row sums = A007437: (1, 4, 7, 14, 16, 31, ...).

Left border = sigma(n), A000203: (1, 3, 4, 7, 6, 12, ...).

Examples

			First few rows of the triangle:
   1;
   3,  1;
   4,  2, 1;
   7,  4, 2, 1;
   6,  4, 3, 2, 1;
  12,  8, 5, 3, 2, 1;
   8,  6, 5, 4, 3, 2, 1;
  15, 11, 8, 6, 4, 3, 2, 1;
  ...
		

Crossrefs

Cf. A051731, A004736, A007436, A000203.

Formula

A051731 * A004736 as infinite lower triangular matrices.