id:A047193 - OEIS Search Results

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

+0
2

0, 0, 2, 3, 4, 14, 20, 27, 83, 119, 164, 494, 714, 1000, 3002, 4367, 6187, 18563, 27131, 38759, 116279, 170543, 245156, 735470, 1081574, 1562274, 4686824, 6906899, 10015004, 30045014, 44352164, 64512239, 193536719, 286097759 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = C(n, [n/3]) - 1 = A051033(n) - 1. - R. Stephan, Mar 16 2004`
	CROSSREFS	`Sequence in context: A140128 A100998 A127283 this_sequence A019137 A140047 A102483` `Adjacent sequences: A047190 A047191 A047192 this_sequence A047194 A047195 A047196`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

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