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A048018 Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n-2)/3. 0
0, 0, 0, 0, 0, 0, 0, 6, 7, 8, 24, 27, 30, 105, 121, 138, 450, 520, 595, 1939, 2255, 2600, 8456, 9877, 11445, 37122, 43510, 50625, 164025, 192801, 225093, 728409, 858199, 1004754, 3248322, 3834655, 4500210, 14536951, 17189667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..39.

CROSSREFS

Sequence in context: A078745 A087663 A112813 * A254714 A047197 A048079

Adjacent sequences:  A048015 A048016 A048017 * A048019 A048020 A048021

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 26 16:30 EST 2021. Contains 340442 sequences. (Running on oeis4.)