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

Author

Gary W. Adamson & Mats Granvik, Mar 31 2009

Keywords

• nonn
• tabl

Comments

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

Examples

			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

Formula

Triangle read by rows, A051731 * A158948