id:A047172 - 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-1)/2.

+0
1

0, 0, 1, 3, 6, 13, 21, 45, 70, 154, 235, 525, 791, 1793, 2681, 6153, 9150, 21206, 31401, 73359, 108262, 254607, 374715, 886171, 1301235, 3091971, 4531423, 10811671, 15818791, 37877401, 55339849, 132924649, 193962894, 467187454 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Sequence in context: A101965 A064290 A064621 this_sequence A034734 A019079 A048134` `Adjacent sequences: A047169 A047170 A047171 this_sequence A047173 A047174 A047175`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research