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A144736 Triangle read by rows, A051731 * A000012 * A051731 * A054533 1
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 (list; table; graph; refs; listen; history; text; internal format)
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: A093321 A302015 A046144 * A137423 A127471 A309044

Adjacent sequences:  A144733 A144734 A144735 * A144737 A144738 A144739

KEYWORD

tabl,sign

AUTHOR

Gary W. Adamson, Sep 20 2008

STATUS

approved

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Last modified July 19 03:54 EDT 2019. Contains 325144 sequences. (Running on oeis4.)