OFFSET
1,1
COMMENTS
Column 1 of A207050.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + a(n-2) + 8*a(n-3) - 2*a(n-4) for n>5.
Empirical g.f.: 3*x*(27 - 4*x + 20*x^2 - 88*x^3 + 20*x^4) / (1 - 2*x - x^2 - 8*x^3 + 2*x^4). - Colin Barker, Jun 17 2018
EXAMPLE
Some solutions for n=4:
2 0 1 1 0 2 2 1 2 1 0 0 1 0 0 2 2 1 2 1
2 2 1 0 0 1 1 1 1 1 2 0 0 0 0 0 2 0 0 0
2 2 2 2 0 1 1 1 1 1 2 2 0 0 0 0 0 0 0 0
2 0 2 2 0 0 0 1 0 0 2 2 0 2 1 2 0 0 0 1
0 0 2 0 0 0 0 0 0 0 0 2 0 0 2 2 2 2 0 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2012
STATUS
approved