A144736 Triangle read by rows, A051731 * A000012 * A051731 * A054533.

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

Offset

1,2

Comments

Row sums = sigma(n), A000203.

Right border = phi(n), A000010

Left border = d(n), A000005

Links

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

Formula

Triangle read by rows, A051731 * A000012 * A051731 * A054533; as infinite lower triangular matrices.

Example

First few rows of the triangle =
1;
2, 1;
2, 0, 2;
3, 0, 2, 2;
2, -2, 1, 1, 4;
4, -2, 3, 0, 5, 2;
2, -4, 0, -1, 4, 1, 6;
4, -5, 2, -1, 4, 1, 6, 4;
3, -6, 1, -3, 4, -2, 6, 4, 6;
4, -8, 0, -4, 8, -3, 7, 3, 7, 4;
...

Crossrefs

A054533, Cf. A000203, A000005, A000010, A051731

Sequence in context: A302015 A046144 A335904 * A137423 A127471 A309044

Adjacent sequences: A144733 A144734 A144735 * A144737 A144738 A144739

Keyword

tabl,sign

Author

Gary W. Adamson, Sep 20 2008

Status

approved