A131032 A097806 * A130296.

1, 3, 1, 5, 2, 1, 7, 2, 2, 1, 9, 2, 2, 2, 1, 11, 2, 2, 2, 2, 1, 13, 2, 2, 2, 2, 2, 1, 15, 2, 2, 2, 2, 2, 2, 1, 17, 2, 2, 2, 2, 2, 2, 2, 1, 19, 2, 2, 2, 2, 2, 2, 2, 2, 1, 21, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 23, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1

Offset

1,2

Comments

Row sums give A008574.

A131033 = A130296 * A097806.

Links

Table of n, a(n) for n=1..78.

Formula

A097806 * A130296 as infinite lower triangular matrices. A097806 = the pairwise operator, A130296 = (1; 2,1; 3,1,1; ...).

Example

First few rows of the triangle are:
1;
3, 1;
5, 2, 1;
7, 2, 2, 1;
9, 2, 2, 2, 1;
11, 2, 2, 2, 2, 1;
13, 2, 2, 2, 2, 2, 1;
...

Crossrefs

Cf. A008574, A097806, A130296, A131033.

Sequence in context: A100576 A212332 A371750 * A130323 A130303 A100898

Adjacent sequences: A131029 A131030 A131031 * A131033 A131034 A131035

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 10 2007

Extensions

Definition corrected and more terms from Georg Fischer, Oct 10 2021

Status

approved