A146311 - OEIS

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A146311

a(n) = Cos[2n ArcSin[Sqrt[3]] = (-1)^n Cosh[2n ArcSinh[Sqrt[2]]

1, -5, 49, -485, 4801, -47525, 470449, -4656965, 46099201, -456335045, 4517251249, -44716177445, 442644523201, -4381729054565, 43374646022449, -429364731169925, 4250272665676801, -42073361925598085 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`With accuracy to sign that same as A001079, a(n)=(-1)^n A001079(n).`
	FORMULA	`a(n)=(-1)^n A001079(n).`
	MATHEMATICA	`Table[Round[N[Cos[2 n ArcSin[Sqrt[3]]], 50]], {n, 0, 100}] (Artur Jasinski)`
	CROSSREFS	`A001079` `Sequence in context: A198969 A155629 A096596 * A001079 A195206 A081474` `Adjacent sequences: A146308 A146309 A146310 * A146312 A146313 A146314`
	KEYWORD	`sign`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Oct 29 2008`

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Last modified February 16 07:10 EST 2012. Contains 205874 sequences.