OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (0,6,0,3).
FORMULA
G.f.: (1 + 3*x)*(1 + x^2) / (1 - 6*x^2 - 3*x^4).
a(n) = 6*a(n-2) + 3*a(n-4) for n>3. - Colin Barker, Jan 18 2018
PROG
(PARI) Vec((1 + 3*x)*(1 + x^2) / (1 - 6*x^2 - 3*x^4) + O(x^40)) \\ Colin Barker, Jan 18 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved