A006673 - OEIS

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A006673

Log of g.f. for Pell numbers.

0, 1, 2, 2, -8, -56, -112, 848, 9088, 25216, -310528, -4334848, -14701568, 270029824, 4554426368, 17536821248, -458243735552, -8926669144064, -37024075153408, 1341521605885952, 29290212127670272, 125297096967061504 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..21.`
	FORMULA	`G.f.: 1-2/Q(0) where Q(k)= 1 + 1/(1 + 2(k+1)/(-1/x +(2k+2)/Q(k+1))); (continued fraction, 3-step). - Sergei N. Gladkovskii, Sep 23 2012` `G.f.: -1/Q(0), where Q(k)= 2k+2 - 1/x + (k+1)(k+2)/Q(k+1); (continued fraction). - Sergei N. Gladkovskii, Apr 15 2013` `G.f.: 1/Q(0), where Q(k)= 1/x*(k+1) - 2 + 1/Q(k+1); (continued fraction). - Sergei N. Gladkovskii, May 07 2013`
	CROSSREFS	`Cf. A000129.` `Sequence in context: A077607 A032030 A184347 * A053978 A181264 A224766` `Adjacent sequences: A006670 A006671 A006672 * A006674 A006675 A006676`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane.`
	STATUS	`approved`

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Last modified June 19 12:08 EDT 2013. Contains 226404 sequences.