OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 8*a(n-2) - 30*a(n-3) + 4*a(n-4) + 48*a(n-5) - 32*a(n-6).
Empirical g.f.: 8*x*(448 - 839*x - 4498*x^2 + 8402*x^3 + 7324*x^4 - 13448*x^5) / ((1 - x)*(1 - 2*x)*(1 - 2*x^2)*(1 - 8*x^2)). - Colin Barker, Oct 13 2018
EXAMPLE
Some solutions for n=5:
0 3 3 0 3 0 3 0 0 1 3 3 0 3 3 3 0 0 3 3 3
0 0 3 3 3 3 3 0 3 1 0 3 3 3 0 3 3 0 0 3 0
3 0 0 3 0 3 0 0 0 1 3 3 0 3 3 3 0 0 3 3 3
0 0 3 3 3 3 3 0 3 1 0 3 3 3 3 0 0 3 3 0 3
3 0 0 3 0 3 0 0 0 1 3 3 0 3 3 3 0 0 3 3 3
3 3 0 0 0 0 0 0 3 1 0 3 3 3 0 3 3 0 0 3 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2013
STATUS
approved