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A048006 Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-1)/3. +0
1
0, 0, 0, 3, 6, 10, 25, 45, 77, 175, 322, 570, 1245, 2325, 4213, 9031, 17061, 31421, 66547, 126763, 236203, 496063, 950818, 1787346, 3730293, 7184421, 13598053, 28243063, 54604081, 103918153, 215008363, 416990563, 797154723 (list; graph; listen)
OFFSET

1,4
CROSSREFS

Sequence in context: A063015 A091616 A117224 this_sequence A068818 A137173 A116544

Adjacent sequences: A048003 A048004 A048005 this_sequence A048007 A048008 A048009

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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