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A047191 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-2)/2. 0
0, 0, 0, 0, 0, 0, 2, 3, 18, 24, 84, 105, 280, 336, 756, 882, 1785, 2044, 4004, 4554, 9504, 10890, 25740, 29887, 77077, 90090, 234454, 273559, 685984, 795704, 1905904, 2196740, 5094390, 5845008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

CROSSREFS

Sequence in context: A037317 A112664 A216890 * A096308 A073529 A134850

Adjacent sequences:  A047188 A047189 A047190 * A047192 A047193 A047194

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)