A131375 A007318 + A046854 - A049310.

1, 2, 1, 1, 3, 1, 2, 3, 4, 1, 1, 6, 6, 5, 1, 2, 5, 13, 10, 6, 1, 1, 9, 15, 24, 15, 7, 1, 2, 7, 27, 35, 40, 21, 8, 1, 1, 12, 28, 66, 70, 62, 28, 9, 1, 2, 9, 46, 84, 141, 126, 91, 36, 10, 1

Offset

0,2

Comments

Row sums = A117591: (1, 3, 5, 10, 19, 37, 72,...).

Links

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

Formula

A007318 + A046854 - A049310 as infinite lower triangular matrices.

Example

First few rows of the triangle are:
1;
2, 1;
1, 3, 1;
2, 3, 4, 1;
1, 6, 6, 5, 1;
2, 5, 13, 10, 6, 1;
1, 9, 15, 24, 15, 7, 1;
...

Crossrefs

Cf. A046854, A007318, A049310, A117591.

Sequence in context: A112544 A198789 A134521 * A358169 A327392 A112798

Adjacent sequences: A131372 A131373 A131374 * A131376 A131377 A131378

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 04 2007

Status

approved