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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
1
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; listen)
OFFSET

1,5
CROSSREFS

Sequence in context: A160726 A062717 A084922 this_sequence A034733 A152233 A053303

Adjacent sequences: A047182 A047183 A047184 this_sequence A047186 A047187 A047188

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

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