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A130582
Column 2 of triangle A130580.
3
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
CROSSREFS
Cf. A130580 (triangle); other columns: A130581, A130583.
Sequence in context: A201631 A125267 A141353 * A126296 A293911 A018014
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 05 2007
STATUS
approved