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A047166 Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= n/2. +0
1
0, 0, 0, 0, 1, 3, 12, 24, 60, 100, 205, 315, 630, 980, 2156, 3528, 8260, 13692, 31620, 51600, 115995, 186945, 418825, 675675, 1535391, 2492919, 5728086, 9324406, 21448791, 34860553, 80006668, 129804808, 298009048, 483483128 (list; graph; listen)
OFFSET

1,6
CROSSREFS

Sequence in context: A112236 A050180 A028725 this_sequence A076506 A009776 A068967

Adjacent sequences: A047163 A047164 A047165 this_sequence A047167 A047168 A047169

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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