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A130269 A002260 * A051340. 1
1, 3, 4, 6, 7, 9, 10, 11, 13, 16, 15, 16, 18, 21, 25, 21, 22, 24, 27, 31, 36, 28, 29, 31, 34, 38, 43, 49, 36, 37, 39, 42, 46, 51, 57, 64, 45, 46, 48, 51, 55, 60, 66, 73, 81, 55, 56, 58, 61, 65, 70, 76, 83, 91, 100 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A002412: (1, 7, 22, 50, 95,...)

LINKS

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

FORMULA

A002260 * A051340 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

3, 4;

6, 7, 9;

10, 11, 13, 16;

15, 16, 18, 21, 25,

21, 22, 24, 27, 31, 36;

28, 29, 31, 34, 38, 43, 49;

...

CROSSREFS

Cf. A002260, A051340, A002412.

Sequence in context: A298109 A184429 A248185 * A290730 A246443 A186495

Adjacent sequences:  A130266 A130267 A130268 * A130270 A130271 A130272

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 18 2007

STATUS

approved

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Last modified December 12 22:06 EST 2019. Contains 329963 sequences. (Running on oeis4.)