A131416 (A000012 * A002260) + (A002260 * A000012) - A000012.

1, 4, 3, 8, 8, 5, 13, 14, 12, 7, 19, 21, 20, 16, 9, 26, 29, 29, 26, 20, 11, 34, 38, 39, 37, 32, 24, 13, 43, 48, 50, 49, 45, 38, 28, 15, 53, 59, 62, 62, 59, 53, 44, 32, 17, 64, 71, 75, 76, 74, 69, 61, 50, 36, 19

Offset

1,2

Comments

Left column = A034856: (1, 4, 8, 13, 19, 26, 34,...). Row sums = A127735: (1, 7, 21, 46, 85...).

Links

Table of n, a(n) for n=1..55.

Formula

(A000012 * A002260) + (A002260 * A000012) - A000012; as infinite lower triangular matrices.

Example

First few rows of the triangle are:
1;
4, 3;
8, 8, 5;
13, 14, 12, 7;
19, 21, 20, 16, 9;
26, 29, 29, 26, 20, 11;
...

Crossrefs

Cf. A002260, A034856, A127735, A000012.

Sequence in context: A116583 A196521 A021699 * A134390 A004125 A137924

Adjacent sequences: A131413 A131414 A131415 * A131417 A131418 A131419

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 08 2007

Status

approved