id:A088809 - OEIS Search Results

Search: id:A088809

Displaying 1-1 of 1 results found.

page 1

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

+0
4

0, 0, 0, 1, 3, 10, 27, 67, 154, 350, 763, 1638, 3450, 7191, 14831, 30398, 61891, 125557, 253841, 511818, 1029863, 2069341, 4153060, 8327646, 16687483, 33422562, 66916342, 133936603, 268026776, 536277032, 1072886163, 2146245056 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`a(n) = 2^n - A085489(n); a non sum-free subset contains at least one subset {u,v, w} with w=u+v.`
	LINKS	`Eric Weisstein's World of Mathematics, Sum-Free Set` `Reinhard Zumkeller, Illustration of initial terms`
	CROSSREFS	`Cf. A000079.` `Sequence in context: A105660 A056681 A100624 this_sequence A069229 A085948 A000471` `Adjacent sequences: A088806 A088807 A088808 this_sequence A088810 A088811 A088812`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 19 2003`

page 1

Search completed in 0.002 seconds

Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research