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A175015
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y-values in the solution to x^2-57*y^2=1.
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2
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0, 20, 6040, 1824060, 550860080, 166357920100, 50239541010120, 15172175027136140, 4581946618654104160, 1383732706658512320180, 417882695464252066590200, 126199190297497465597920220
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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 A174759.
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LINKS
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FORMULA
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a(n) = 302*a(n-1)-a(n-2) with a(1)=0, a(2)=20.
G.f.: 20*x^2/(1-302*x+x^2).
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MATHEMATICA
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LinearRecurrence[{302, -1}, {0, 20}, 30]
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PROG
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(Magma) I:=[0, 20]; [n le 2 select I[n] else 302*Self(n-1)-Self(n-2): n in [1..20]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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