A127778 Triangle T(n,k) = A002411(k) read by rows.

1, 1, 6, 1, 6, 18, 1, 6, 18, 40, 1, 6, 18, 40, 75, 1, 6, 18, 40, 75, 126, 1, 6, 18, 40, 75, 126, 196, 1, 6, 18, 40, 75, 126, 196, 288

Offset

1,3

Links

Table of n, a(n) for n=1..36.

Formula

Equals the matrix product A002260 * A127773 as infinite lower triangular matrices.

Example

First few rows of the triangle are:
1;
1, 6;
1, 6, 18;
1, 6, 18, 40;
1, 6, 18, 40, 75;
...

Crossrefs

Cf. A002411, A001296 (row sums), A127773, A002260, A127777.

Sequence in context: A199230 A199101 A366868 * A076714 A299620 A113811

Adjacent sequences: A127775 A127776 A127777 * A127779 A127780 A127781

Keyword

nonn,easy,tabl

Author

Gary W. Adamson, Jan 28 2007

Status

approved