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A131350 2*A007318 - A049310 as infinite lower triangular matrices. 1
1, 2, 1, 1, 4, 1, 2, 4, 6, 1, 1, 8, 9, 8, 1, 2, 7, 20, 16, 10, 1, 1, 12, 24, 40, 25, 12, 1, 2, 10, 42, 60, 70, 36, 14, 1, 1, 16, 46, 112, 125, 112, 49, 16, 1, 2, 13, 72, 148, 252, 231, 168, 64, 18, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A099036 starting (1, 3, 6, 13, 27, 56, 115,...).

LINKS

Table of n, a(n) for n=0..54.

EXAMPLE

First few rows of the triangle are:

1;

2, 1;

1, 4, 1;

2, 4, 6, 1;

1, 8, 9, 8, 1;

2, 7, 20, 16, 10, 1;

1, 12, 24, 40, 25, 12, 1;

...

CROSSREFS

Cf. A007318, A049310, A131350.

Sequence in context: A301906 A302150 A193554 * A131087 A105475 A249061

Adjacent sequences: A131347 A131348 A131349 * A131351 A131352 A131353

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 02 2007

STATUS

approved

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Last modified December 9 04:13 EST 2022. Contains 358698 sequences. (Running on oeis4.)