OFFSET
1,2
COMMENTS
Base 9 analog of A278742.
LINKS
Colin Barker, Table of n, a(n) for n = 1..1000
N. J. A. Sloane, Illustration of initial terms
Index entries for linear recurrences with constant coefficients, signature (0,0,0,9).
FORMULA
For k>7, a(k+4) = 9*a(k).
G.f.: x*(1 + 2*x + 3*x^2 + 9*x^3 + x^4 - 8*x^6) / ((1 - 3*x^2)*(1 + 3*x^2)). - Colin Barker, Jan 10 2017
MATHEMATICA
LinearRecurrence[{0, 0, 0, 9}, {1, 2, 3, 9, 10, 18, 19}, 50] (* Harvey P. Dale, Feb 28 2022 *)
PROG
(PARI) Vec(x*(1 + 2*x + 3*x^2 + 9*x^3 + x^4 - 8*x^6) / ((1 - 3*x^2)*(1 + 3*x^2)) + O(x^50)) \\ Colin Barker, Jan 10 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, Jan 09 2017
STATUS
approved