id:A047182 - 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-2)/2.

+0
2

0, 0, 0, 3, 4, 14, 20, 55, 83, 209, 329, 791, 1286, 3002, 5004, 11439, 19447, 43757, 75581, 167959, 293929, 646645, 1144065, 2496143, 4457399, 9657699, 17383859, 37442159, 67863914, 145422674, 265182524, 565722719, 1037158319 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(n) = C(n, [(n-2)/2]) - 1 = A037955(n) - 1. - R. Stephan, Mar 16 2004`
	CROSSREFS	`Sequence in context: A079274 A024863 A025107 this_sequence A080878 A110565 A057433` `Adjacent sequences: A047179 A047180 A047181 this_sequence A047183 A047184 A047185`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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