A131767 2*A007318 - A065941.

1, 1, 1, 1, 3, 1, 1, 5, 4, 1, 1, 7, 9, 6, 1, 1, 9, 16, 17, 7, 1, 1, 11, 25, 36, 24, 9, 1, 1, 13, 36, 65, 60, 36, 10, 1, 1, 15, 49, 106, 125, 102, 46, 12, 1, 1, 17, 64, 161, 231, 237, 148, 62, 13, 1

Offset

0,5

Links

Table of n, a(n) for n=0..54.

Formula

2*A007318 - A065941 as infinite lower triangular matrices.

Example

First few rows of the triangle are:
1;
1, 1;
1, 3, 1;
1, 5, 4, 1;
1, 7, 9, 6, 1;
1, 9, 16, 17, 7, 1;
1, 11, 25, 36, 24, 9, 1;
...

Crossrefs

Cf. A007318, A065941, A027934 (row sums).

Sequence in context: A191751 A285409 A208510 * A026780 A209421 A320435

Adjacent sequences: A131764 A131765 A131766 * A131768 A131769 A131770

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 13 2007

Status

approved