id:A048011 - OEIS Search Results

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

+0
1

0, 0, 0, 0, 0, 0, 10, 20, 35, 105, 168, 252, 588, 930, 1452, 3960, 6820, 11440, 30745, 52507, 86905, 219765, 372120, 617610, 1572228, 2702252, 4563344, 11666760, 20167170, 34220634, 86461704, 149465844, 254222289, 639438019 (list; graph; listen)

	OFFSET	`1,7`
	CROSSREFS	`Sequence in context: A130720 A046285 A048030 this_sequence A047881 A020953 A033846` `Adjacent sequences: A048008 A048009 A048010 this_sequence A048012 A048013 A048014`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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