id:A048010 - 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)/3.

+0
1

0, 0, 0, 0, 1, 5, 10, 30, 70, 105, 213, 405, 558, 1110, 2310, 3300, 7435, 16575, 23855, 52871, 113815, 160615, 346745, 744345, 1047438, 2299998, 5036862, 7110522, 15770601, 34636245, 48767082, 107787262, 236331302, 331877557 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A133629 A156302 A156234 this_sequence A002571 A077916 A056422` `Adjacent sequences: A048007 A048008 A048009 this_sequence A048011 A048012 A048013`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

AT&T Labs Research