id:A048095 - OEIS Search Results

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

+0
1

0, 0, 0, 2, 3, 4, 5, 6, 18, 21, 24, 27, 30, 33, 36, 138, 156, 175, 195, 216, 238, 261, 285, 310, 1150, 1260, 1375, 1495, 1620, 1750, 1885, 2025, 2170, 2320, 2475, 11035, 11935, 12880, 13871, 14909, 15995, 17130, 18315, 19551, 20839 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Sequence in context: A124365 A115896 A116018 this_sequence A031015 A024639 A123678` `Adjacent sequences: A048092 A048093 A048094 this_sequence A048096 A048097 A048098`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research