id:A048071 - 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)/3.

+0
1

0, 1, 2, 5, 9, 14, 34, 55, 83, 209, 329, 494, 1286, 2001, 3002, 8007, 12375, 18563, 50387, 77519, 116279, 319769, 490313, 735470, 2042974, 3124549, 4686824, 13123109, 20030009, 30045014, 84672314, 129024479, 193536719 (list; graph; listen)

	OFFSET	`1,3`
	CROSSREFS	`Sequence in context: A090937 A071609 A068501 this_sequence A051892 A006599 A013933` `Adjacent sequences: A048068 A048069 A048070 this_sequence A048072 A048073 A048074`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research