A143442 - OEIS

A143442

Triangle read by rows, A127648 * A000012 * A128407, 1 <= k <= n.

1, 2, -2, 3, -3, -3, 4, -4, -4, 0, 5, -5, -5, 0, -5, 6, -6, -6, 0, -6, 6, 7, -7, -7, 0, -7, 7, -7, 8, -8, -8, 0, -8, 8, -8, 0, 9, -9, -9, 0, -9, 9, -9, 0, 0, 10, -10, -10, 0, -10, 10, -10, 0, 0, 10, 11, -11, -11, 0, -11, 11, -11, 0, 0, 11, -11

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OFFSET

1,2

COMMENTS

Row sums = A143443, n * (A002321, the Mertens function) = (1, 0, -3, -4, -10, -6, ...).

Right border = n*mu(n).

LINKS

Table of n, a(n) for n=1..66.

FORMULA

Triangle read by rows, A127648 * A000012 * A128407, 1 <= k <= n; where A127648 = an infinite lower triangular matrix with (1, 2, 3, ...) in the main diagonal, the rest zeros. A128407 = diagonalized mu(n) matrix.

EXAMPLE

First few rows of the triangle =

2, -2;

3, -3, -3;

4, -4, -4, 0;

5, -5, -5, 0, -5;

6, -6, -6, 0, -6, 6;

7, -7, -7, 0, -7, 7, -7;

...

CROSSREFS

Cf. A002321, A008683, A127648, A128407, A143443.

Sequence in context: A070082 A085727 A343005 * A137300 A201052 A278044

Adjacent sequences: A143439 A143440 A143441 * A143443 A143444 A143445

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Aug 15 2008

STATUS

approved