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A131046
0
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
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
Sequence in context: A055418 A062432 A220018 * A109803 A262280 A027968
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Jun 11 2007
EXTENSIONS
More terms from Carl Najafi, Sep 08 2011
STATUS
approved