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A048074 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n+2)/3. +0
1
0, 0, 0, 0, 2, 8, 12, 30, 63, 86, 182, 392, 560, 1270, 2800, 4070, 9020, 19595, 28679, 63518, 138866, 205478, 455966, 997640, 1485624, 3290520, 7201692, 10782222, 23878212, 52311408, 78678468, 174179258, 381766253, 576312440 (list; graph; listen)
OFFSET

1,5
CROSSREFS

Sequence in context: A027718 A115102 A047174 this_sequence A126775 A069185 A037197

Adjacent sequences: A048071 A048072 A048073 this_sequence A048075 A048076 A048077

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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