id:A048012 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-1)/3.

+0
1

0, 0, 0, 0, 0, 0, 0, 0, 0, 21, 28, 36, 144, 180, 220, 550, 660, 780, 2275, 2821, 3465, 13230, 16940, 21420, 74256, 94248, 118104, 367080, 461700, 574644, 1824690, 2310000, 2899380, 9684840, 12357532, 15634300, 51798175, 66098175 (list; graph; listen)

	OFFSET	`1,10`
	CROSSREFS	`Sequence in context: A103083 A120735 A009727 this_sequence A130202 A162692 A048067` `Adjacent sequences: A048009 A048010 A048011 this_sequence A048013 A048014 A048015`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research