OFFSET
1,2
LINKS
FORMULA
G.f.: x*(1+x)*(2*x+1) / ( (x-1)*(6*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 27 2015
MATHEMATICA
Table[FromDigits[PadRight[{}, n, {1, 3, 2}], 6], {n, 30}] (* or *) LinearRecurrence[ {6, 0, 1, -6}, {1, 9, 56, 337}, 30] (* Harvey P. Dale, Nov 05 2016 *)
PROG
(PARI) a(n)=([0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1; -6, 1, 0, 6]^(n-1)*[1; 9; 56; 337])[1, 1] \\ Charles R Greathouse IV, Feb 13 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved