id:A048066 - OEIS Search Results

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

+0
1

0, 0, 0, 0, 0, 0, 0, 20, 35, 105, 168, 364, 588, 1260, 2250, 4960, 9460, 20020, 38500, 77001, 148161, 286689, 560469, 1071525, 2143051, 4064071, 8259196, 15473436, 31705476, 58620692, 120894085, 221227279, 459855214 (list; graph; listen)

	OFFSET	`1,8`
	CROSSREFS	`Adjacent sequences: A048063 A048064 A048065 this_sequence A048067 A048068 A048069` `Sequence in context: A081962 A024755 A048022 this_sequence A135801 A078210 A116657`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

AT&T Labs Research