A047181 - OEIS

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A047181

Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-1)/2.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 42, 48, 168, 189, 504, 560, 1260, 1386, 2827, 3090, 6270, 6864, 15444, 17094, 44044, 49335, 135135, 152152, 408968, 460139, 1174224, 1316904

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,11

LINKS

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

CROSSREFS

Sequence in context: A152119 A041080 A042091 * A080879 A119108 A248264

Adjacent sequences: A047178 A047179 A047180 * A047182 A047183 A047184

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved