A146312 - OEIS

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A146312

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

2, 242, 23762, 2328482, 228167522, 22358088722, 2190864527282, 214682365584962, 21036680962799042, 2061380051988721202, 201994208413931878802, 19793371044513335401442 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`General formula: Cosh[(2 n - 1) ArcSinh[Sqrt[2]]]^2 + Cos[(2 n - 1) ArcSin[Sqrt[3]]]^2 = 1`
	FORMULA	`a(n)=A146312(n)-1`
	MATHEMATICA	`Table[Round[ -N[Cos[(2 n - 1) ArcSin[Sqrt[3]]], 300]^2], {n, 1, 50}] (Artur Jasinski)`
	CROSSREFS	`A146311, A146313` `Sequence in context: A006523 A055968 A074256 * A109930 A013509 A013505` `Adjacent sequences: A146309 A146310 A146311 * A146313 A146314 A146315`
	KEYWORD	`nonn`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Oct 29 2008`

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.