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A048025 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-2)/3. 0
0, 0, 0, 0, 0, 1, 6, 12, 42, 112, 168, 378, 759, 1014, 1914, 3564, 4620, 9295, 20020, 27027, 63083, 146648, 199304, 456484, 1007454, 1339464, 2896664, 6165494, 8093214, 17441739, 37871064, 49876200, 111029050, 247813500 (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: A152787 A060551 A129113 * A120471 A219522 A034529

Adjacent sequences:  A048022 A048023 A048024 * A048026 A048027 A048028

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 26 17:36 EST 2021. Contains 340442 sequences. (Running on oeis4.)