A158951 Triangle read by rows, A051731 * A158948

1, 2, 1, 3, 0, 1, 4, 2, 0, 1, 4, 0, 1, 0, 1, 7, 2, 1, 1, 0, 1, 5, 0, 1, 0, 1, 0, 1, 8, 3, 0, 2, 0, 1, 0, 18, 0, 2, 0, 1, 0, 1, 0, 1, 10, 2, 1, 1, 1, 1, 0, 1, 0, 1

Offset

1,2

Comments

Row sums = sigma(n), A000203. Left column = A079247

Links

Table of n, a(n) for n=1..54.

Formula

Triangle read by rows, A051731 * A158948

Example

First few rows of the triangle =
1;
2, 1;
3, 0, 1;
4, 2, 0, 1;
4, 0, 1, 0, 1;
7, 2, 1, 1, 0, 1;
5, 0, 1, 0, 1, 0, 1;
8, 3, 0, 2, 0, 1, 0, 1;
8, 0, 2, 0, 1, 0, 1, 0, 1;
10, 2, 1, 1, 1, 1, 0, 1, 0, 1;
7, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
15, 4, 1, 3, 0, 2, 0, 10, 1, 0, 1;
8, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
13, 2, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1;
...

Crossrefs

Cf. A158948, A000203, A051731

Sequence in context: A158906 A309229 A143239 * A126988 A280499 A347351

Adjacent sequences: A158948 A158949 A158950 * A158952 A158953 A158954

Keyword

nonn,tabl

Author

Gary W. Adamson & Mats Granvik, Mar 31 2009

Status

approved