OFFSET
0,1
COMMENTS
Tends to 4^n. "Braided" because the order of b(n), c(n) and d(n) changes between the six possibilities as n increases.
FORMULA
Conjectures from Colin Barker, Sep 02 2016: (Start)
a(n) = 9*a(n-1)-33*a(n-2)+52*a(n-3) for n>2.
G.f.: (2-10*x+17*x^2) / ((1-4*x)*(1-5*x+13*x^2)).
(End)
EXAMPLE
a(1) = 3*2+2*1-1*0 = 8.
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Nov 14 2001
STATUS
approved