OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..500
Index entries for linear recurrences with constant coefficients, signature (9,-4).
FORMULA
G.f.: x/(1-9x+4*x^2). - Philippe Deléham, Oct 12 2011
E.g.f.: (2/sqrt(65))*exp(9*x/2)*sinh(sqrt(65)*x/2). - G. C. Greubel, Aug 25 2022
MATHEMATICA
LinearRecurrence[{9, -4}, {0, 1}, 50]
PROG
(Magma) [2^(n-1)*Evaluate(ChebyshevU(n), 9/4): n in [0..30]]; // G. C. Greubel, Aug 25 2022
(SageMath)
A190981 = BinaryRecurrenceSequence(9, -4, 0, 1)
[A190981(n) for n in (0..30)] # G. C. Greubel, Aug 25 2022
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vladimir Joseph Stephan Orlovsky, May 24 2011
STATUS
approved