A144736 - OEIS

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

(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 =

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