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A174778
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y-values in the solution to x^2 - 41*y^2 = 1.
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2
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0, 320, 1311360, 5373952960, 22022457918720, 90248027176961600, 369836393348730718080, 1515589449695071305730240, 6210885195014008862151805440, 25452206013577958622026792962880
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OFFSET
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1,2
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COMMENTS
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The corresponding values of x of this Pell equation are in A174752.
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..200
Index entries for linear recurrences with constant coefficients, signature (4098,-1).
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FORMULA
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a(n) = 4098*a(n-1)-a(n-2) with a(1)=0, a(2)=320.
G.f.: 320*x^2/(1-4098*x+x^2).
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MATHEMATICA
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LinearRecurrence[{4098, -1}, {0, 320}, 30]
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PROG
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(MAGMA) I:=[0, 320]; [n le 2 select I[n] else 4098*Self(n-1)-Self(n-2): n in [1..20]];
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CROSSREFS
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Cf. A174752.
Sequence in context: A045813 A121011 A264063 * A300849 A261262 A308527
Adjacent sequences: A174775 A174776 A174777 * A174779 A174780 A174781
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Apr 15 2010
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STATUS
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approved
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