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A134446 A128174 * A002260. 2
1, 1, 2, 2, 2, 3, 2, 4, 3, 4, 3, 4, 6, 4, 5, 3, 6, 6, 8, 5, 6, 4, 6, 9, 8, 10, 6, 7, 4, 8, 9, 12, 10, 12, 7, 8, 5, 8, 12, 12, 15, 12, 14, 8, 9, 5, 10, 12, 16, 15, 18, 14, 16, 9, 10 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row sums = A002623: (1, 3, 7, 13, 22, 34,...).

LINKS

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

FORMULA

A128174 * A002260 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 2;

2, 2, 3;

2, 4, 3, 4;

3, 4, 6, 4, 5;

3, 6, 6, 8, 5, 6;

4, 6, 9, 8, 10, 6, 7;

...

CROSSREFS

Cf. A002260, A128174, A002623.

Sequence in context: A304101 A278636 A126336 * A125749 A014085 A248891

Adjacent sequences:  A134443 A134444 A134445 * A134447 A134448 A134449

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 25 2007

STATUS

approved

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Last modified August 23 01:10 EDT 2019. Contains 326211 sequences. (Running on oeis4.)