A130582 Column 2 of triangle A130580.

1, 1, 3, 6, 13, 30, 76, 211, 638, 2088, 7354, 27731, 111449, 475449, 2145316, 10205714, 51038980, 267623147, 1467786895, 8401550878, 50087295107, 310419697655, 1996491898802, 13303966566481, 91714857551787

Offset

0,3

Links

Table of n, a(n) for n=0..24.

Crossrefs

Cf. A130580 (triangle); other columns: A130581, A130583.

Sequence in context: A201631 A125267 A141353 * A126296 A293911 A018014

Adjacent sequences: A130579 A130580 A130581 * A130583 A130584 A130585

Keyword

nonn

Author

Paul D. Hanna, Jun 05 2007

Status

approved