id:A107706 - OEIS Search Results

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Quadratic recurrence a(n)=2a(n-1)^2+a(n-2), a(0)=a(1)=1.

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1, 1, 3, 19, 725, 1051269, 2210333021447, 9771144131398048324998887, 190950515273109040540985906104397627141067435498985, 72924198566131697919005645563941249133599421947333610081098812005030529313728193495031984760197059337 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) a(n)=if(n<0, -a(-1-n), if(n<2, 1, 2*a(n-1)^2+a(n-2)))`
	CROSSREFS	`Adjacent sequences: A107703 A107704 A107705 this_sequence A107707 A107708 A107709` `Sequence in context: A079306 A051381 A136372 this_sequence A114301 A098796 A120563`
	KEYWORD	`nonn`
	AUTHOR	`Michael Somos, May 22 2005`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

AT&T Labs Research