id:A047188 - 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-2)/2.

+0
1

0, 0, 0, 0, 0, 4, 10, 30, 60, 121, 217, 385, 700, 1260, 2521, 4711, 9940, 18340, 38500, 68772, 142833, 250185, 523965, 914485, 1950949, 3405402, 7357416, 12788516, 27747356, 47902764, 104171886, 178864378, 390678883, 668688388 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A025179 A116388 A048044 this_sequence A002220 A090578 A007713` `Adjacent sequences: A047185 A047186 A047187 this_sequence A047189 A047190 A047191`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research