id:A048078 - OEIS Search Results

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Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n+2)/3.

+0
1

0, 0, 0, 0, 0, 0, 6, 10, 15, 60, 84, 112, 280, 360, 450, 1110, 1430, 1815, 5775, 7735, 10192, 33124, 44100, 57680, 170968, 223720, 288456, 846600, 1105800, 1427850, 4401540, 5784240, 7521360, 23544510, 30936334, 40225735, 124110415 (list; graph; listen)

	OFFSET	`1,7`
	CROSSREFS	`Adjacent sequences: A048075 A048076 A048077 this_sequence A048079 A048080 A048081` `Sequence in context: A088708 A020159 A048017 this_sequence A117309 A108936 A117002`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research