OFFSET
1,2
LINKS
FORMULA
G.f.: x*(1+2*x) / ( (x-1)*(5*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 27 2015
MATHEMATICA
Table[FromDigits[PadRight[{}, n, {1, 2, 0}], 5], {n, 30}] (* or *) LinearRecurrence[{5, 0, 1, -5}, {1, 7, 35, 176}, 30] (* Harvey P. Dale, Jul 05 2022 *)
PROG
(PARI) a(n)=([0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1; -5, 1, 0, 5]^(n-1)*[1; 7; 35; 176])[1, 1] \\ Charles R Greathouse IV, Feb 13 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved