A048023 - OEIS

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A048023

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

0

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 36, 45, 180, 220, 264, 660, 780, 910, 2821, 3465, 4220, 16940, 21420, 26775, 94248, 118104, 146300, 461700, 574644, 708477, 2310000, 2899380, 3610540, 12357532, 15634300, 19623175, 66098175

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,11

LINKS

Table of n, a(n) for n=1..38.

CROSSREFS

Sequence in context: A303261 A168106 A061900 * A359529 A105710 A192226

Adjacent sequences: A048020 A048021 A048022 * A048024 A048025 A048026

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved