OFFSET
0,2
COMMENTS
Also zero together with period 9: repeat [3, 3, 3, 6, 6, 6, 9, 9, 9].
Also the decimal expansion of 334001/1001001.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,-1,1,0,-1,1).
FORMULA
From Stefano Spezia, Aug 30 2022: (Start)
G.f.: 3*x*(1 + 2*x^3 + 3*x^6)/((1 - x)*(1 + x^3 + x^6)).
a(n) = a(n-1) - a(n-3) + a(n-4) - a(n-6) + a(n-7) for n > 7. (End)
MATHEMATICA
PadRight[{0}, 120, {9, 3, 3, 3, 6, 6, 6, 9, 9}] (* Harvey P. Dale, Mar 22 2018 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Peter M. Chema, Jan 18 2017
STATUS
approved