OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (0,0,2).
FORMULA
From Colin Barker, Jul 19 2013: (Start)
a(n) = 2*a(n-3) for n>4.
G.f.: -(3*x^4 + 3*x^3 + 4*x^2 + 2*x + 1) / (2*x^3 - 1). (End)
Sum_{n>=0} 1/a(n) = 94/35. - Amiram Eldar, Jan 21 2022
MATHEMATICA
CoefficientList[Series[-(3 x^4 + 3 x^3 + 4 x^2 + 2 x + 1) / (2 x^3 - 1), {x, 0, 40}], x] (* Vincenzo Librandi, Jul 20 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Jul 19 2013
STATUS
approved