OFFSET
1,1
COMMENTS
Column 6 of A204284.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -6*a(n-4) +4*a(n-6) for n>8.
Empirical g.f.: x*(14141 - 41688*x - 1427*x^2 - 1352*x^3 + 82896*x^4 + 2918*x^5 - 53524*x^6 - 128*x^7) / ((1 - x)*(1 - 2*x - 2*x^2)*(1 - 2*x^3)). - Colin Barker, Jun 06 2018
EXAMPLE
Some solutions for n=4:
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
0 0 1 1 2 1 0 1 0 1 0 2 1 2 2 1 0 1 1 2 1 2 0 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2012
STATUS
approved