id:A048096 - OEIS Search Results

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

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0, 0, 0, 0, 2, 8, 20, 41, 63, 126, 252, 505, 1000, 1936, 3652, 7305, 14313, 27573, 52325, 97868, 180404, 327692, 586568, 1034930, 2718254, 5012504, 9131804, 16440929, 29259404, 51482510, 89575460, 154146135, 262403715, 441956955 (list; graph; listen)

	OFFSET	`1,5`
	CROSSREFS	`Sequence in context: A007290 A049031 A058037 this_sequence A072250 A057566 A009303` `Adjacent sequences: A048093 A048094 A048095 this_sequence A048097 A048098 A048099`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research