A047185 - OEIS

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A047185

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

0, 0, 0, 1, 4, 8, 20, 30, 63, 86, 182, 245, 560, 756, 1784, 2387, 5600, 7400, 17336, 22737, 53850, 70390, 168610, 219791, 529529, 688051, 1662907, 2154347, 5225636, 6754580, 16451036, 21225758, 51878873, 66826712

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

OFFSET

1,5

LINKS

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

CROSSREFS

Sequence in context: A062717 A084922 A180794 * A349546 A034733 A365964

Adjacent sequences: A047182 A047183 A047184 * A047186 A047187 A047188

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved