A128409 - OEIS

A128409

Triangle read by rows: A000012 * A128408 as infinite lower triangular matrices.

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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,11

COMMENTS

Left border = the Mertens sequence: A002321: (1, 0, -1, -1, -2, ...).

Right border = mu(n), A008683: (1, -1, -1, 0, -1, 1, -1, ...).

Row sums = A062563: (1, -1, -3, -3, -5, -1, -3, ...).

LINKS

Table of n, a(n) for n=1..91.

EXAMPLE

First few rows of the triangle:

0, -1;