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

1,2

Comments

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

Links

Table of n, a(n) for n=1..66.

Formula

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

Example

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

Sequence in context: A378037 A093682 A344767 * A134543 A305540 A197871

Adjacent sequences: A187880 A187881 A187882 * A187884 A187885 A187886

Keyword

nonn,tabl

Author

Gary W. Adamson, Mar 15 2011

Status

approved