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A048084 Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+3)/3. 0
0, 0, 1, 2, 3, 9, 12, 15, 40, 51, 63, 175, 220, 270, 759, 945, 1155, 3311, 4102, 5005, 14547, 17955, 21875, 64275, 79116, 96288, 285413, 350568, 426303, 1272601, 1560449, 1896279, 5694129, 6972339, 8468163, 25554035, 31253950 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..37.

CROSSREFS

Sequence in context: A088084 A182203 A168080 * A067719 A057017 A330298

Adjacent sequences:  A048081 A048082 A048083 * A048085 A048086 A048087

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 28 14:58 EDT 2020. Contains 333089 sequences. (Running on oeis4.)