id:A048032 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n-3)/3.

+0
1

0, 0, 0, 0, 0, 5, 15, 35, 70, 141, 261, 405, 765, 1485, 2310, 4954, 10634, 16575, 35945, 75725, 113815, 240385, 502945, 744345, 1595433, 3411849, 5036862, 10959446, 23631286, 34636245, 75326163, 162418479, 236331302, 514828047 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A139761 A137360 A100355 this_sequence A019499 A019531 A091875` `Adjacent sequences: A048029 A048030 A048031 this_sequence A048033 A048034 A048035`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research