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A070880 Let m = number of ways of partitioning n into parts using the all parts of a subset of {1, 2, ..., n-1}; a(n) gives number of different subsets of {1, 2, ..., n-1} whose m is 0. +0
2
0, 0, 1, 3, 10, 22, 52, 110, 234, 482, 987, 1997, 4035, 8113, 16288, 32644, 65388, 130886, 261922 (list; graph; listen)
OFFSET

1,4

EXAMPLE

a(4)=3 because there are three different subsets, {3}, {2,3} & {1,2,3}.

CROSSREFS

Cf. A088314, A088528.

Sequence in context: A140066 A006503 A023554 this_sequence A027164 A166119 A041403

Adjacent sequences: A070877 A070878 A070879 this_sequence A070881 A070882 A070883

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto (pcmusume(AT)m11.alpha-net.ne.jp), Nov 16 2003

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Last modified December 5 17:24 EST 2009. Contains 170342 sequences.


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