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

1,4

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.

Links

Table of n, a(n) for n=1..55.

Formula

A133698 * A051731 as infinite lower triangular matrices.

Example

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.

Sequence in context: A039976 A287267 A317540 * A230417 A287263 A102442

Adjacent sequences: A133698 A133699 A133700 * A133702 A133703 A133704

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Sep 21 2007

Status

approved