A131046 A007318 * A000203.

1, 4, 11, 29, 71, 168, 389, 884, 1978, 4375, 9592, 20874, 45124, 96979, 207402, 441724, 937393, 1982767, 4181349, 8793756, 18448907, 38620883, 80690867, 168285817, 350383797, 728381793, 1511953441, 3134224224, 6489055959, 13419472021

Offset

1,2

Links

Table of n, a(n) for n=1..30.

Formula

Binomial transform of sigma(n), A000203.

Example

a(4) = 29 = (1, 3, 3, 1) dot (1, 3, 4, 7) = (1 + 9 + 12 + 7).

Crossrefs

Cf. A000203, A007318.

Sequence in context: A055418 A062432 A220018 * A109803 A262280 A027968

Adjacent sequences: A131043 A131044 A131045 * A131047 A131048 A131049

Keyword

nonn

Author

Gary W. Adamson, Jun 11 2007

Extensions

More terms from Carl Najafi, Sep 08 2011

Status

approved