id:A131721 - OEIS Search Results

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Overlay of Pell companion numbers: a(n)=A001333(n)+A001333(n-6).

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1, 1, 3, 7, 17, 41, 100, 240, 580, 1400, 3380, 8160, 19700, 47560, 114820, 277200, 669220, 1615640, 3900500, 9416640, 22733780, 54884200, 132502180, 319888560, 772279300, 1864447160, 4501173620, 10866794400, 26234762420, 63336319240 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = A001333(n), n<6. a(n) = A001333(n)+A001333(n-6) = 20*A000129(n-3), n>=6.` `O.g.f.: (x-1)(x^2+1)(x^4-x^2+1)/(-1+2x+x^2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008`
	CROSSREFS	`Cf. cf. A131710.` `Sequence in context: A078057 A123335 A089742 this_sequence A058351 A086395 A020730` `Adjacent sequences: A131718 A131719 A131720 this_sequence A131722 A131723 A131724`
	KEYWORD	`nonn`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Sep 15 2007`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008`

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

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