A131350 2*A007318 - A049310 as infinite lower triangular matrices.

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

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