A128317 A054523 * signed A007318.

1, 0, 1, 3, -2, 1, 0, 4, -3, 1, 5, -4, 6, -4, 1, 0, 5, -9, 10, -5, 1, 7, -6, 15, -20, 15, -6, 1, 0, 12, -24, 36, -35, 21, -7, 1, 9, -12, 30, -56, 70, -56, 28, -8, 1, 0, 9, -30, 80, -125, 126, -84, 36, -9, 1

Offset

1,4

Comments

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

Links

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

Formula

A054523 * A007318 as infinite lower triangular matrices. A007318 is signed by columns: (+, -, +, ...).

Example

First few rows of the triangle:
  1;
  0,  1;
  3, -2,  1;
  0,  4, -3,   1;
  5, -4,  6,  -4,  1;
  0,  5, -9,  10, -5,  1;
  7, -6, 15, -20, 15, -6, 1;
  ...

Crossrefs

Cf. A054523, A007318, A000010.

Sequence in context: A307333 A031251 A194885 * A344348 A179753 A279318

Adjacent sequences: A128314 A128315 A128316 * A128318 A128319 A128320

Keyword

tabl,sign

Author

Gary W. Adamson, Feb 25 2007

Status

approved