id:A088810 - OEIS Search Results

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Number of subsets of {1, ..., n} that are double-free but not sum-free.

+0
3

0, 0, 0, 0, 1, 4, 6, 18, 35, 84, 137, 323, 591, 1313, 2033, 4360, 7406, 15581, 23682, 49184, 84017, 171744, 259818, 528784, 853143, 1727011, 2601181, 5243126 (list; graph; listen)

	OFFSET	`0,6`
	COMMENT	`a(n) = A050291(n) - A007865(n) = A088809(n) - A088812(n).`
	LINKS	`Eric Weisstein's World of Mathematics, Double-Free Set` `Eric Weisstein's World of Mathematics, Sum-Free Set` `Reinhard Zumkeller, Illustration of initial terms`
	CROSSREFS	`Adjacent sequences: A088807 A088808 A088809 this_sequence A088811 A088812 A088813` `Sequence in context: A026689 A138276 A156096 this_sequence A005199 A107390 A051253`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 19 2003`

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Last modified November 9 12:23 EST 2009. Contains 166233 sequences.

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