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A175672
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y-values in the solution to x^2 - 28*y^2=1.
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3
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0, 24, 6096, 1548360, 393277344, 99890897016, 25371894564720, 6444361328541864, 1636842405555068736, 415751526649658917080, 105599250926607809869584, 26821793983831734047957256
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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 A175633.
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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 (254,-1).
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FORMULA
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a(n) = 254*a(n-1)-a(n-2) with a(1)=0, a(2)=24.
G.f.: 24*x^2/(1-254*x+x^2).
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MATHEMATICA
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LinearRecurrence[{254, -1}, {0, 24}, 20]
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PROG
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(MAGMA) I:=[0, 24]; [n le 2 select I[n] else 254*Self(n-1)-Self(n-2): n in [1..15]];
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CROSSREFS
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Cf. A175633.
Sequence in context: A277001 A163576 A145408 * A181749 A266312 A181232
Adjacent sequences: A175669 A175670 A175671 * A175673 A175674 A175675
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KEYWORD
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nonn,easy,less
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AUTHOR
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Vincenzo Librandi, Dec 04 2010
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STATUS
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approved
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