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A047169 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= n/2. 0
0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 30, 36, 126, 147, 392, 448, 1008, 1134, 2304, 2565, 5115, 5687, 12342, 13860, 34320, 39039, 104104, 119119, 315679, 360815, 913640, 1039808, 2508928, 2842604 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Sequence in context: A002352 A042647 A041273 * A124482 A224219 A128867

Adjacent sequences:  A047166 A047167 A047168 * A047170 A047171 A047172

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 22 18:33 EDT 2014. Contains 248400 sequences.