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A134447 A002260 * A128174. 0
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 (list; table; graph; refs; listen; history; text; internal format)
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 are:

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;

...

CROSSREFS

Cf. A128174, A002260, A049778.

Sequence in context: A331810 A182817 A082864 * A093056 A271320 A331279

Adjacent sequences:  A134444 A134445 A134446 * A134448 A134449 A134450

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 25 2007

STATUS

approved

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Last modified July 30 12:08 EDT 2021. Contains 346359 sequences. (Running on oeis4.)