A128257 - OEIS

A128257

Inverse Moebius transform of A097807.

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

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OFFSET

0,4

COMMENTS

Row sums = A001227: (1, 1, 2, 1, 2, 2, 2,...), number of odd divisors of n.

LINKS

Table of n, a(n) for n=0..90.

FORMULA

A051731 * A097807 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

0, 1;