OFFSET
1,1
COMMENTS
Column 2 of A210107.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-1) - 3*a(n-2) - 4*a(n-3).
Conjectures from Colin Barker, Jul 14 2018: (Start)
G.f.: 5*x*(6 - 3*x - 4*x^2) / ((1 - x)*(1 - 7*x - 4*x^2)).
a(n) = (1/13)*2^(-2-n)*(13*2^(1+n) + (117-11*sqrt(65))*(7-sqrt(65))^n + (7+sqrt(65))^n*(117+11*sqrt(65))).
(End)
EXAMPLE
Some solutions for n=4:
0 0 0 0 0 0 0 1 1 0 1 0 0 0 1 0 1 2 0 1 2
0 0 0 0 0 0 1 2 0 2 1 2 0 0 2 0 2 0 1 2 0
1 2 1 0 0 0 1 0 1 2 0 1 2 1 1 2 1 2 1 0 1
1 0 2 0 0 0 0 2 0 0 1 2 2 0 2 1 0 1 0 2 2
0 2 1 0 0 0 2 1 2 0 2 0 2 1 0 0 2 2 2 1 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2012
STATUS
approved