id:A088813 - OEIS Search Results

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Number of subsets of {1, ..., n} that are double-free or sum-free.

+0
3

1, 2, 4, 7, 14, 26, 43, 79, 137, 246, 398, 733, 1237, 2314, 3586, 6730, 11051, 21096, 31985, 61654, 102730, 199555, 301062, 589746, 942876, 1858881, 2793703, 5524251 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n) = 2^n - A088812(n) = A050291(n)+A085489(n)-A007865(n).`
	LINKS	`Eric Weisstein's World of Mathematics, Double-Free Set` `Eric Weisstein's World of Mathematics, Sum-Free Set`
	CROSSREFS	`Adjacent sequences: A088810 A088811 A088812 this_sequence A088814 A088815 A088816` `Sequence in context: A072810 A065455 A026010 this_sequence A097596 A054191 A079975`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 19 2003`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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