A143467 Triangle read by rows, A143315 * A128407, 1<=k<=n.

1, 3, -1, 5, 0, -1, 7, -3, 0, 0, 9, 0, 0, 0, -1, 11, -5, -3, 0, 0, 1, 13, 0, 0, 0, 0, 0, -1, 15, -7, 0, 0, 0, 0, 0, 0, 17, 0, -5, 0, 0, 0, 0, 0, 0, 19, -9, 0, 0, -3, 0, 0, 0, 0, 1, 21, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 23, -11, -7, 0, 0, 3, 0, 0, 0, 0, 0, 0, 25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1

Offset

1,2

Comments

Row sums = A140434: (1, 2, 4, 4, 8, 4, 12, 8, 12,...).

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

Links

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

Example

First few rows of the triangle =
1;
3, -1;
5, 0, -1;
7, -3, 0, 0;
9, 0, 0, 0, -1;
11, -5, -3, 0, 0, 1;
13, 0, 0, 0, 0, 0, -1;
...

Crossrefs

Cf. A008683, A128407, A143315, A143467.

Sequence in context: A340190 A143677 A249150 * A143315 A237588 A235796

Adjacent sequences: A143464 A143465 A143466 * A143468 A143469 A143470

Keyword

tabl,sign

Author

Gary W. Adamson, Aug 17 2008

Extensions

a(66) corrected by Georg Fischer, Aug 14 2023

Status

approved