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A048072 Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n+2)/3. +0
1
0, 0, 1, 2, 6, 13, 21, 45, 91, 154, 322, 645, 1125, 2325, 4651, 8301, 17061, 34123, 61915, 126763, 253527, 465746, 950818, 1901637, 3527109, 7184421, 14368843, 26855641, 54604081, 109208163, 205390163, 416990563, 833981127 (list; graph; listen)
OFFSET

1,4
CROSSREFS

Sequence in context: A082722 A030416 A006284 this_sequence A026052 A049616 A064960

Adjacent sequences: A048069 A048070 A048071 this_sequence A048073 A048074 A048075

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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