A128584 A054521 * A128064 (unsigned).

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

Offset

1,5

Comments

Row sums = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6, 4, 6, 4, ...).

Links

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

Formula

A054521 * A128064 (unsigned) as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  1,  0;
  0,  2,  0;
  1, -2,  3,  0;
  0,  0,  0,  4,  0;
  1,  0,  0, -4,  5,  0;
  ...

Crossrefs

Cf. A054521, A128064, A000010.

Sequence in context: A162986 A319203 A321198 * A327853 A080099 A268040

Adjacent sequences: A128581 A128582 A128583 * A128585 A128586 A128587

Keyword

tabl,sign

Author

Gary W. Adamson, Mar 11 2007

Extensions

a(28) = 0 inserted and more terms from Georg Fischer, May 29 2023

Status

approved