id:A048083 - OEIS Search Results

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

+0
1

0, 0, 0, 2, 6, 9, 21, 45, 70, 154, 322, 525, 1125, 2325, 3921, 8301, 17061, 29491, 61915, 126763, 223210, 465746, 950818, 1698453, 3527109, 7184421, 12981421, 26855641, 54604081, 99589963, 205390163, 416990563, 766466053, 1576646941 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Sequence in context: A088902 A095967 A047161 this_sequence A127931 A077237 A056879` `Adjacent sequences: A048080 A048081 A048082 this_sequence A048084 A048085 A048086`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

AT&T Labs Research