id:A047185 - OEIS Search Results

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

+0
1

0, 0, 0, 1, 4, 8, 20, 30, 63, 86, 182, 245, 560, 756, 1784, 2387, 5600, 7400, 17336, 22737, 53850, 70390, 168610, 219791, 529529, 688051, 1662907, 2154347, 5225636, 6754580, 16451036, 21225758, 51878873, 66826712 (list; graph; listen)

	OFFSET	`1,5`
	CROSSREFS	`Sequence in context: A087254 A062717 A084922 this_sequence A034733 A053303 A097164` `Adjacent sequences: A047182 A047183 A047184 this_sequence A047186 A047187 A047188`
	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