id:A048065 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n-4)/2.

+0
1

0, 0, 0, 0, 0, 5, 15, 30, 70, 105, 213, 286, 558, 720, 1500, 1935, 4455, 5775, 13895, 17876, 42484, 53859, 124761, 156065, 357825, 444015, 1028500, 1272155, 3002795, 3709043, 8871603, 10935267, 26243427 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A059160 A028895 A010898 this_sequence A048021 A133268 A056108` `Adjacent sequences: A048062 A048063 A048064 this_sequence A048066 A048067 A048068`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

AT&T Labs Research