OFFSET
1,1
COMMENTS
Column 1 of A206206.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 17*a(n-3) - 5*a(n-4) + 2*a(n-5) for n>6.
Empirical g.f.: 4*x*(64 - 72*x + 82*x^2 - 567*x^3 + 170*x^4 - 64*x^5) / (1 - 3*x - 17*x^3 + 5*x^4 - 2*x^5). - Colin Barker, Jun 14 2018
EXAMPLE
Some solutions for n=4:
1 3 1 2 2 0 1 1 0 2 1 3 1 0 3 3 1 0 2 2
1 1 1 2 2 2 1 3 0 0 2 2 0 0 1 1 0 0 1 1
1 1 1 2 2 2 3 3 0 0 2 2 0 0 1 1 0 0 1 1
3 0 1 1 0 0 3 3 1 0 2 0 0 2 2 3 1 2 2 0
3 3 1 1 0 0 2 2 1 0 2 3 1 1 2 2 1 1 3 3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2012
STATUS
approved