id:A047176 - 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-1)/2.

+0
1

0, 0, 0, 0, 0, 2, 3, 15, 20, 60, 75, 175, 210, 435, 511, 1071, 1260, 2940, 3510, 8910, 10725, 27345, 32835, 80795, 96382, 230230, 273273, 649805, 770315, 1860131, 2208115, 5426995, 6451500, 15974220 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Adjacent sequences: A047173 A047174 A047175 this_sequence A047177 A047178 A047179` `Sequence in context: A101047 A066491 A101507 this_sequence A037175 A048613 A030072`
	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