OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-2) - 48*a(n-4).
Empirical g.f.: 4*x*(10 + 27*x - 72*x^2 - 192*x^3) / ((1 - 6*x^2)*(1 - 8*x^2)). - Colin Barker, Oct 18 2018
EXAMPLE
Some solutions for n=5:
3 0 2 2 3 0 1 3 1 1 3 0 0 1 3 3 1 0 1 3
1 1 3 0 1 1 2 1 0 3 2 2 3 1 0 3 0 2 3 2
3 0 1 1 3 0 0 2 1 1 3 0 0 1 1 1 1 0 0 2
0 0 3 0 2 2 2 1 0 3 2 2 3 1 3 0 0 2 1 0
0 3 1 1 3 0 1 3 3 3 3 0 0 1 3 3 1 0 1 3
1 1 3 0 1 1 1 0 3 0 2 2 3 1 0 3 1 3 1 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2014
STATUS
approved