id:A047168 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= n/2.

+0
1

0, 0, 0, 0, 0, 0, 0, 4, 5, 25, 30, 90, 105, 245, 280, 588, 666, 1458, 1665, 4125, 4785, 12705, 14850, 38830, 45331, 113399, 131859, 320411, 371735, 903175, 1048840, 2594540, 3021240, 7594920 (list; graph; listen)

	OFFSET	`1,8`
	CROSSREFS	`Adjacent sequences: A047165 A047166 A047167 this_sequence A047169 A047170 A047171` `Sequence in context: A041531 A089499 A042601 this_sequence A144053 A084465 A056200`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 16 16:43 EDT 2008. Contains 145098 sequences.

AT&T Labs Research