A128432 - OEIS

A128432

Triangle read by rows: A128407 * A054521.

1, -1, 0, -1, -1, 0, 0, 0, 0, 0, -1, -1, -1, -1, 0, 1, 0, 0, 0, 1, 0, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0

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OFFSET

1,1

COMMENTS

Row sums = A023900: (1, -1, -2, 0, -4, 2, -6, ...) Left border = mu(n), A008683.

LINKS

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

FORMULA

A128407 * A054521 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle:

-1, 0;

-1, -1, 0;

0, 0, 0, 0;

-1, -1, -1, -1, 0;

1, 0, 0, 0, 1, 0;

-1, -1, -1, -1, -1, -1, 0;

0, 0, 0, 0, 0, 0, 0, 0;

...

CROSSREFS

Cf. A128407, A054521, A008683, A023900.

Sequence in context: A137161 A329677 A077050 * A195198 A039966 A089451

Adjacent sequences: A128429 A128430 A128431 * A128433 A128434 A128435

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Mar 03 2007

STATUS

approved