id:A047187 - 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)/2.

+0
1

0, 0, 0, 0, 1, 2, 10, 15, 45, 60, 140, 175, 360, 435, 891, 1071, 2415, 2940, 7260, 8910, 22359, 27345, 66625, 80795, 191191, 230230, 541190, 649805, 1548755, 1860131, 4514979, 5426995, 13295955, 15974220 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Adjacent sequences: A047184 A047185 A047186 this_sequence A047188 A047189 A047190` `Sequence in context: A031222 A134861 A063610 this_sequence A048043 A043429 A105041`
	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