id:A073845 - OEIS Search Results

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a(1)=a(2)=1, a(n+2)=a(n+1)+a(n)+(-2)^n.

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1, 1, 0, 5, -3, 18, -17, 65, -80, 241, -351, 914, -1485, 3525, -6152, 13757, -25163, 54130, -102105, 214169, -412224, 850521, -1658855, 3385970, -6661493, 13501693, -26714232, 53896325, -107035635, 215296146, -428610401, 860427569, -1715666480, 3439728385, -6865872687 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`For n>3, a(n) = (-1)^nfloor{(1/5)( 2^n + (2sqrt(5)-3)(-phi)^n) } where phi is the golden ratio = (1+sqrt(5))/2`
	CROSSREFS	`Sequence in context: A092893 A133172 A075453 this_sequence A092525 A101367 A049457` `Adjacent sequences: A073842 A073843 A073844 this_sequence A073846 A073847 A073848`
	KEYWORD	`sign`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 02 2002`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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