id:A048021 - 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-2)/3.

+0
1

0, 0, 0, 0, 1, 5, 15, 30, 70, 141, 213, 405, 765, 1110, 2310, 4954, 7435, 16575, 35945, 52871, 113815, 240385, 346745, 744345, 1595433, 2299998, 5036862, 10959446, 15770601, 34636245, 75326163, 107787262, 236331302, 514828047 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A028895 A010898 A048065 this_sequence A133268 A056108 A055831` `Adjacent sequences: A048018 A048019 A048020 this_sequence A048022 A048023 A048024`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research