A048048 - OEIS

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A048048

Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n+1)/3.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 10, 11, 66, 72, 78, 273, 294, 315, 840, 896, 952, 2142, 2268, 2394, 4959, 5230, 5502, 12012, 12705, 13409, 34914, 37224, 39600, 117975, 126412, 135135, 405405, 434434, 464464, 1309959, 1400455

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OFFSET

1,14

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Sequence in context: A227801 A048031 A048013 * A136835 A031166 A202706

Adjacent sequences: A048045 A048046 A048047 * A048049 A048050 A048051

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved