OFFSET
1,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
FORMULA
G.f.: (Sum_{i>=2} x^Fibonacci(i))^3.
a(n) = A121548(n,3).
EXAMPLE
a(6)=7 because we have 6=1+2+3=1+3+2=2+1+3=2+3+1=3+1+2=3+2+1=2+2+2.
MAPLE
with(combinat): g:=sum(z^fibonacci(i), i=2..30)^3: gser:=series(g, z=0, 130): seq(coeff(gser, z, n), n=1..126);
CROSSREFS
KEYWORD
nonn
AUTHOR
Emeric Deutsch, Aug 07 2006
STATUS
approved