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A047189 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-2)/2. +0
1
0, 0, 0, 0, 0, 0, 0, 10, 15, 60, 84, 210, 280, 630, 846, 2142, 3045, 8400, 12320, 32802, 48048, 121110, 176670, 437580, 642642, 1608607, 2391895, 6034600, 9050470, 22712326, 34185606, 84996158, 128251383, 317302008 (list; graph; listen)
OFFSET

1,8
CROSSREFS

Sequence in context: A048061 A092192 A119039 this_sequence A035407 A020139 A056522

Adjacent sequences: A047186 A047187 A047188 this_sequence A047190 A047191 A047192

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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