A143620 Triangle read by rows, square of A054521, 1<=k<=n.

1, 1, 0, 2, 0, 0, 2, 1, 0, 0, 4, 1, 1, 0, 0, 2, 1, 1, 1, 0, 0, 6, 2, 2, 1, 1, 0, 0, 4, 3, 2, 2, 1, 1, 0, 0, 6, 2, 4, 2, 2, 1, 1, 0, 0, 4, 3, 1, 2, 2, 1, 1, 1, 0, 0, 10, 4, 5, 3, 4, 1, 3, 1, 1, 0, 0, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 0, 0

Offset: 1

Author

Gary W. Adamson, Aug 27 2008

Keywords

• nonn
• tabl

Comments

Left border = phi(n), A000010.

Row sums = A053570: (1, 1, 2, 3, 6, 5, 12, 13,...).

Examples

			First few rows of the triangle =
1;
1, 0;
2, 0, 0;
2, 1, 0, 0;
4, 1, 1, 0, 0;
2, 1, 1, 1, 0, 0;
6, 2, 2, 1, 1, 0, 0;
4, 3, 2, 2, 1, 1, 0, 0;
6, 2, 4, 2, 2, 1, 1, 0, 0;
...
		

Crossrefs

Cf. A054521, A000010, A053570.

Formula

Triangle read by rows, square of A054521, 1<=k<=n