A187883 Triangle by rows, A003983 * A000012 as infinite lower triangular matrices.

1, 2, 1, 4, 3, 1, 6, 5, 3, 1, 9, 8, 6, 3, 1, 12, 11, 9, 6, 3, 1, 16, 15, 13, 10, 6, 3, 1, 20, 19, 17, 14, 10, 6, 3, 1, 25, 24, 22, 19, 15, 10, 6, 3, 1, 30, 29, 27, 24, 20, 15, 10, 6, 3, 1, 36, 35, 33, 30, 26, 21, 15, 10, 6, 3, 1

Offset: 1

Author

Gary W. Adamson, Mar 15 2011

Keywords

• nonn
• tabl

Comments

Sum of n-th row terms = A034828(n+1).

Examples

			Row 4 = (6, 5, 3, 1), since row 4 of the A003983 triangle = (1, 2, 2, 1).
First few rows of the triangle =
1
2, 1
4, 3, 1
6, 5, 3, 1
9, 8, 6, 3, 1
12, 11, 9, 6, 3, 1
16, 15, 13, 10, 6, 3, 1
20, 19, 17, 14, 10, 6, 3, 1
25, 24, 22, 19, 15, 10, 6, 3, 1
30, 29, 27, 24, 20, 15, 10, 6, 3, 1
36, 35, 33, 30, 26, 21, 15, 10, 6, 3, 1
42, 41, 39, 36, 32, 27, 21, 15, 10, 6, 3, 1
...
		

Crossrefs

Cf. A034828

Formula

Given the correlation triangle A003983, partial sums of terms starting from the right.