id:A047161 - 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/2.

+0
1

0, 0, 1, 2, 6, 9, 21, 30, 70, 100, 235, 335, 791, 1127, 2681, 3822, 9150, 13050, 31401, 44802, 108262, 154517, 374715, 534963, 1301235, 1858155, 4531423, 6472167, 15818791, 22597759, 55339849, 79067374, 193962894, 277164294 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Sequence in context: A106529 A088902 A095967 this_sequence A048083 A127931 A077237` `Adjacent sequences: A047158 A047159 A047160 this_sequence A047162 A047163 A047164`
	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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