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A130313 A000012 * A054523. 0
1, 2, 1, 4, 1, 1, 6, 2, 1, 1, 10, 2, 1, 1, 1, 12, 4, 2, 1, 1, 1, 18, 4, 2, 1, 1, 1, 1, 22, 6, 2, 2, 1, 1, 1, 1, 28, 6, 4, 2, 1, 1, 1, 1, 1, 32, 10, 4, 2, 2, 1, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = the triangular series, A000217: (1, 3, 6, 10,...). Left column = A002088: (1, 2, 4, 6, 10, 12, 18,...).

LINKS

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

FORMULA

A000012 * A054523 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

2, 1;

4, 1, 1;

6, 2, 1, 1;

10, 2, 1, 1, 1;

12, 4, 2, 1, 1, 1;

18, 4, 2, 1, 1, 1, 1;

...

CROSSREFS

Cf. A000012, A054523, A000217.

Sequence in context: A118745 A235671 A131034 * A247073 A124428 A191310

Adjacent sequences:  A130310 A130311 A130312 * A130314 A130315 A130316

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, May 21 2007

STATUS

approved

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Last modified September 25 06:32 EDT 2020. Contains 337335 sequences. (Running on oeis4.)