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A048083 Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n+3)/3. 0
0, 0, 0, 2, 6, 9, 21, 45, 70, 154, 322, 525, 1125, 2325, 3921, 8301, 17061, 29491, 61915, 126763, 223210, 465746, 950818, 1698453, 3527109, 7184421, 12981421, 26855641, 54604081, 99589963, 205390163, 416990563, 766466053, 1576646941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

CROSSREFS

Sequence in context: A316429 A047161 A318193 * A127931 A077237 A056879

Adjacent sequences:  A048080 A048081 A048082 * A048084 A048085 A048086

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)