A133701 A133698 * A051731.

1, 1, 1, 2, 0, 2, 1, 1, 0, 1, 2, 0, 0, 0, 2, 2, 2, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, 1, 1, 0, 1, 0, 0, 0, 1, 3, 0, 3, 0, 0, 0, 0, 0, 3, 2, 2, 0, 0, 2, 0, 0, 0, 0, 2

Offset: 1

Author

Gary W. Adamson, Sep 21 2007

Keywords

• nonn
• tabl
• more

Comments

Left and right borders = A001227: (1, 1, 2, 1, 2, 2, 2, ...), the number of odd divisors of n.

Row sums = A133702, the inverse Mobius transform of A023136.

Examples

			First few rows of the triangle:
  1;
  1, 1;
  2, 0, 2;
  1, 1, 0, 1;
  2, 0, 0, 0, 2;
  2, 2, 2, 0, 0, 2;
  2, 0, 0, 0, 0, 0, 2;
  1, 1, 0, 1, 0, 0, 0, 1;
  ...
		

Crossrefs

Cf. A051731, A133698, A001227, A133702, A023136.

Formula

A133698 * A051731 as infinite lower triangular matrices.