A134545 - OEIS

A134545

A051731 * A004736.

1, 3, 1, 4, 2, 1, 7, 4, 2, 1, 6, 4, 3, 2, 1, 12, 8, 5, 3, 2, 1, 8, 6, 5, 4, 3, 2, 1, 15, 11, 8, 6, 4, 3, 2, 1, 13, 10, 8, 6, 5, 4, 3, 2, 1, 18, 14, 11, 9, 7, 5, 4, 3, 2, 1

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OFFSET

1,2

COMMENTS

Row sums = A007437: (1, 4, 7, 14, 16, 31, ...).

Left border = sigma(n), A000203: (1, 3, 4, 7, 6, 12, ...).

LINKS

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

FORMULA

A051731 * A004736 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle:

3, 1;

4, 2, 1;

7, 4, 2, 1;

6, 4, 3, 2, 1;

12, 8, 5, 3, 2, 1;

8, 6, 5, 4, 3, 2, 1;

15, 11, 8, 6, 4, 3, 2, 1;

...

CROSSREFS

Cf. A051731, A004736, A007436, A000203.

Sequence in context: A135821 A289205 A283866 * A174907 A237016 A135822

Adjacent sequences: A134542 A134543 A134544 * A134546 A134547 A134548

KEYWORD

nonn,tabl,more

AUTHOR

Gary W. Adamson, Oct 31 2007

STATUS

approved