id:A047165 - 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.

+0
1

0, 0, 0, 0, 0, 0, 3, 4, 20, 25, 75, 90, 210, 245, 511, 588, 1260, 1458, 3510, 4125, 10725, 12705, 32835, 38830, 96382, 113399, 273273, 320411, 770315, 903175, 2208115, 2594540, 6451500, 7594920 (list; graph; listen)

	OFFSET	`1,7`
	CROSSREFS	`Adjacent sequences: A047162 A047163 A047164 this_sequence A047166 A047167 A047168` `Sequence in context: A041561 A050214 A051719 this_sequence A124631 A062870 A067281`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research