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A047199 Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= n/3. +0
1
0, 0, 0, 0, 0, 4, 10, 20, 60, 105, 168, 364, 588, 930, 2250, 3960, 6820, 17380, 30745, 52507, 126763, 219765, 372120, 898380, 1572228, 2702252, 6619596, 11666760, 20167170, 49146654, 86461704, 149465844, 363087604, 639438019 (list; graph; listen)
OFFSET

1,6
CROSSREFS

Sequence in context: A056412 A032275 A015220 this_sequence A038065 A038422 A009870

Adjacent sequences: A047196 A047197 A047198 this_sequence A047200 A047201 A047202

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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