A143469 Triangle read by rows, A000012 * A143315 * A128407, 1<=k<=1.

1, 4, -1, 9, -1, -1, 16, -4, -1, 0, 25, -4, -1, 0, -1, 36, -9, -4, 0, -1, 1, 49, -9, -4, 0, -1, 1, -1, 64, -16, -4, 0, -1, 1, -1, 0, 81, -16, -9, 0, -1, 1, -1, 0, 0, 100, -25, -9, 0, -4, 1, -1, 0, 0, 1, 121, -25, -9, 0, -4, 1, -1, 0, 0, 1, -1, 144, -36, -16, 0, -4, 4, -1, 0, 0, 1, -1, 0

Offset

1,2

Comments

Row sums = A018805: (1, 3, 7, 11, 19, 23, 35,...).

Right border = mu(n), A008683.

Links

Table of n, a(n) for n=1..78.

Example

First few rows of the triangle =
1;
4, -1;
9, -1, -1;
16, -4, -1, 0;
25, -4, -1, 0, -1;
36, -9, -4, 0, -1, 1;
49, -9, -4, 0, -1, 1, -1;
...

Crossrefs

Cf. A008683, A018805, A128407, A143315.

Sequence in context: A141681 A176215 A364016 * A360610 A331147 A208508

Adjacent sequences: A143466 A143467 A143468 * A143470 A143471 A143472

Keyword

tabl,sign

Author

Gary W. Adamson, Aug 17 2008

Extensions

a(9) corrected and more terms from Georg Fischer, Aug 14 2023

Status

approved