OFFSET
0,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 0, 0, -1, 1).
FORMULA
From R. J. Mathar, Apr 13 2010: (Start)
a(n)= a(n-1) - a(n-9) + a(n-10).
G.f.: (1+2*x+6*x^2-x^3-3*x^4+10*x^5-8*x^6-5*x^7+4*x^8+13*x^9)/ ((1-x) * (1+x) * (x^2 -x+1) * (x^6-x^3+1)). (End)
a(n) = a(n-18). - G. C. Greubel, Mar 12 2016
MATHEMATICA
PowerMod[3, Range[0, 50], 19] (* G. C. Greubel, Mar 12 2016 *)
PROG
(Sage) [power_mod(3, n, 19)for n in range(0, 75)] # Zerinvary Lajos, Nov 25 2009
(PARI) a(n)=lift(Mod(3, 19)^n) \\ Charles R Greathouse IV, Mar 22 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved