OFFSET
1,3
LINKS
P. Moree, Convoluted convolved Fibonacci numbers, arXiv:math/0311205 [math.CO], 2003.
Index entries for linear recurrences with constant coefficients, signature (3,0,-4,-3,3,7,-3,-3,4,0,-3,-1)
FORMULA
G.f.: (z/3)[1/(1-z-z^2)^3-1/(1-z^3-z^6)].
a(n) = +3*a(n-1) -4*a(n-3) -3*a(n-4) +3*a(n-5) +7*a(n-6) -3*a(n-7) -3*a(n-8) +4*a(n-9) -3*a(n-11) -a(n-12). - R. J. Mathar, Jan 25 2011
MAPLE
with(numtheory): f := z->1/(1-z-z^2): m := proc(r, j) d := divisors(r): W := (1/r)*z*sum(mobius(d[i])*f(z^d[i])^(r/d[i]), i=1..nops(d)): Wser := simplify(series(W, z=0, 80)): coeff(Wser, z^j) end: seq(m(3, j), j=1..40);
MATHEMATICA
gf = (z/3) (1/(1 - z - z^2)^3 - 1/(1 - z^3 - z^6));
CoefficientList[gf + O[z]^40, z] // Rest (* Jean-François Alcover, Dec 01 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 05 2003
EXTENSIONS
Edited by Emeric Deutsch, Mar 06 2004
STATUS
approved