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A128136 A128132 * A002260. 1
1, 1, 4, 2, 4, 9, 3, 6, 9, 16, 4, 8, 12, 16, 25, 5, 10, 15, 20, 25, 36, 6, 12, 18, 24, 30, 36, 49, 7, 14, 21, 28, 35, 42, 49, 64, 8, 16, 24, 32, 40, 48, 56, 64, 81, 9, 18, 27, 36, 45, 54, 63, 72, 81, 100 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row sums = A006003: (1, 5, 15, 34, 65,...) A002260 * A128132 = A128137

LINKS

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

FORMULA

A128132 * A002260 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

1, 4;

2, 4, 9;

3, 6, 9, 16;

4, 8, 12, 16, 25;

5, 10, 15, 20, 25, 36;

6, 12, 18, 24, 30, 36, 49;

...

CROSSREFS

Cf. A128132, A002260, A006003, A128137.

Sequence in context: A016693 A137718 A007361 * A048147 A203001 A051666

Adjacent sequences:  A128133 A128134 A128135 * A128137 A128138 A128139

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Feb 16 2007

STATUS

approved

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Last modified March 30 16:16 EDT 2020. Contains 333127 sequences. (Running on oeis4.)