id:A047193 - OEIS Search Results

Search: id:A047193

Displaying 1-1 of 1 results found.

page 1

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 A163128 A140047` `Adjacent sequences: A047190 A047191 A047192 this_sequence A047194 A047195 A047196`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

page 1

Search completed in 0.002 seconds

Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

AT&T Labs Research