id:A088812 - OEIS Search Results

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Number of subsets of {1, ..., n} that are neither double-free nor sum-free.

+0
4

0, 0, 0, 1, 2, 6, 21, 49, 119, 266, 626, 1315, 2859, 5878, 12798, 26038, 54485, 109976, 230159, 462634, 945846, 1897597, 3893242, 7798862, 15834340, 31695551, 64315161, 128693477 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`a(n) = 2^n - A088813(n) = A088808(n)-A088811(n) = A088809(n)-A088810(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	`Sequence in context: A066893 A004192 A104143 this_sequence A001434 A119098 A116842` `Adjacent sequences: A088809 A088810 A088811 this_sequence A088813 A088814 A088815`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 19 2003`

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

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