id:A048040 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+1)/3.

+0
1

0, 0, 0, 0, 3, 4, 5, 15, 18, 21, 63, 76, 90, 270, 325, 385, 1155, 1390, 1651, 5005, 6027, 7175, 21875, 26348, 31416, 96288, 116010, 138510, 426303, 513729, 614019, 1896279, 2285569, 2734171, 8468163, 10208110, 12220780, 37941280 (list; graph; listen)

	OFFSET	`1,5`
	CROSSREFS	`Sequence in context: A062201 A049895 A051530 this_sequence A051033 A031199 A059184` `Adjacent sequences: A048037 A048038 A048039 this_sequence A048041 A048042 A048043`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

AT&T Labs Research