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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
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..30.
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FORMULA
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Binomial transform of sigma(n), A000203.
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EXAMPLE
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a(4) = 29 = (1, 3, 3, 1) dot (1, 3, 4, 7) = (1 + 9 + 12 + 7).
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CROSSREFS
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Cf. A000203, A007318.
Sequence in context: A055418 A062432 A220018 * A109803 A027968 A027970
Adjacent sequences: A131043 A131044 A131045 * A131047 A131048 A131049
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson, Jun 11 2007
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EXTENSIONS
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More terms from Carl Najafi, Sep 08 2011
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STATUS
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approved
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