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A047198 Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= n/3. +0
1
0, 0, 0, 0, 1, 2, 10, 30, 45, 105, 213, 286, 558, 1110, 1500, 3300, 7435, 10415, 23855, 52871, 73255, 160615, 346745, 476910, 1047438, 2299998, 3181482, 7110522, 15770601, 21851202, 48767082, 107787262, 149093417, 331877557 (list; graph; listen)
OFFSET

1,6
CROSSREFS

Sequence in context: A098408 A063564 A076440 this_sequence A162524 A065137 A034262

Adjacent sequences: A047195 A047196 A047197 this_sequence A047199 A047200 A047201

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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