OFFSET
1,2
COMMENTS
The corresponding values of x of this Pell equation are in A174759.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..200
Index entries for linear recurrences with constant coefficients, signature (302,-1).
FORMULA
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).
a(n) = ((151+20*sqrt(57))^(n-1) - (151-20*sqrt(57))^(n-1)) / (2*sqrt(57)). - Alan Michael Gómez Calderón, Oct 06 2023
MATHEMATICA
LinearRecurrence[{302, -1}, {0, 20}, 30]
PROG
(Magma) I:=[0, 20]; [n le 2 select I[n] else 302*Self(n-1)-Self(n-2): n in [1..20]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 15 2010
STATUS
approved