A178650 - OEIS

A178650

Triangle read by rows A051731 * A070909.

1, 2, 1, 2, 0, 1, 3, 1, 1, 1, 2, 0, 1, 0, 1, 4, 1, 2, 0, 1, 1, 2, 0, 1, 0, 1, 0, 1, 4, 1, 2, 1, 1, 0, 1, 1, 3, 0, 2, 0, 1, 0, 1, 0, 1, 4, 1, 2, 0, 2, 0, 1, 0, 1, 1, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 6, 1, 4, 1, 2, 1, 1, 0, 1, 0, 1, 1

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OFFSET

1,2

COMMENTS

Row sums = A069734: (1, 3, 3, 6, 4, 9, 5, 11,...)

Left border = d(n), A000005

LINKS

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

FORMULA

As infinite lower triangular matrices, A051731 * A070909; where A051731 = the inverse Mobius transform.

EXAMPLE

First few rows of the triangle =

2, 1;

2, 0, 1;

3, 1, 1, 1;

2, 0, 1, 0, 1;

4, 1, 2, 0, 1, 1;

2, 0, 1, 0, 1, 0, 1;

4, 1, 2, 1, 1, 0, 1, 1;

3, 0, 2, 0, 1, 0, 1, 0, 1;

4, 1, 2, 0, 2, 0, 1, 0, 1, 1;

2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;

6, 1, 4, 1, 2, 1, 1, 0, 1, 0, 1, 1;

2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;

4, 1, 2, 0, 2, 0, 2, 0, 1, 0, 1, 0, 1, 1;

4, 0, 3, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1

5, 1, 3, 1, 2, 0, 2, 1, 1, 0, 1, 0, 1, 0, 1, 1;

2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;

...

CROSSREFS

Cf. A051731, A070909, A069734.

Sequence in context: A063574 A372095 A144515 * A028933 A190491 A364835

Adjacent sequences: A178647 A178648 A178649 * A178651 A178652 A178653

KEYWORD

nonn,tabf

AUTHOR

Gary W. Adamson, May 31 2010

STATUS

approved