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A048085 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n+3)/3. +0
1
0, 0, 0, 0, 2, 3, 12, 30, 40, 86, 182, 245, 560, 1270, 1784, 4070, 9020, 12782, 28679, 63518, 91286, 205478, 455966, 662151, 1485624, 3290520, 4814672, 10782222, 23878212, 35172819, 78678468, 174179258, 257964134, 576312440 (list; graph; listen)
OFFSET

1,5
CROSSREFS

Sequence in context: A136703 A075269 A089414 this_sequence A069062 A073618 A025560

Adjacent sequences: A048082 A048083 A048084 this_sequence A048086 A048087 A048088

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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