A048068 - OEIS

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A048068

Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-4)/2.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 45, 50, 150, 165, 385, 420, 906, 988, 2340, 2583, 7035, 7875, 22275, 25080, 67880, 76415, 196027, 220389, 551733, 620711

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

OFFSET

1,12

LINKS

Table of n, a(n) for n=1..33.

CROSSREFS

Sequence in context: A222354 A041933 A041138 * A037957 A165239 A103315

Adjacent sequences: A048065 A048066 A048067 * A048069 A048070 A048071

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved