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A134447

1, 1, 2, 4, 2, 3, 4, 6, 3, 4, 9, 6, 8, 4, 5, 9, 12, 8, 10, 5, 6, 16, 12, 15, 10, 12, 6, 7, 16, 20, 15, 18, 12, 14, 7, 8, 25, 20, 24, 18, 21, 14, 16, 8, 9, 25, 30, 24, 28, 21, 24, 16, 18, 9, 10

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OFFSET

1,3

COMMENTS

Row sums = A049778: (1, 3, 9, 17, 32, 50, 78, ...).

LINKS

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

FORMULA

A002260 * A128174 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle:

1, 2;

4, 2, 3;

4, 6, 3, 4;

9, 6, 8, 4, 5;

9, 12, 8, 10, 5, 6;

16, 12, 15, 10, 12, 6, 7;

...

CROSSREFS

Cf. A128174, A002260, A049778.

Sequence in context: A331810 A182817 A082864 * A093056 A271320 A354739

Adjacent sequences: A134444 A134445 A134446 * A134448 A134449 A134450

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 25 2007

STATUS

approved

URL: https://oeis.org/A134447

⇱ A134447 - OEIS