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A047174 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-1)/2. +0
1
0, 0, 0, 1, 2, 8, 12, 30, 40, 86, 110, 245, 315, 756, 980, 2387, 3080, 7400, 9480, 22737, 29040, 70390, 89870, 219791, 280423, 688051, 876603, 2154347, 2741102, 6754580, 8586788, 21225758, 26965808, 66826712 (list; graph; listen)
OFFSET

1,5
CROSSREFS

Sequence in context: A107755 A027718 A115102 this_sequence A048074 A126775 A069185

Adjacent sequences: A047171 A047172 A047173 this_sequence A047175 A047176 A047177

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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