OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 82*a(n-2) + 320*a(n-3) + 144*a(n-4) - 448*a(n-5) + 64*a(n-6).
Empirical g.f.: 4*x*(42 + 447*x + 1304*x^2 + 400*x^3 - 1760*x^4 + 256*x^5) / (1 - 82*x^2 - 320*x^3 - 144*x^4 + 448*x^5 - 64*x^6). - Colin Barker, Oct 20 2018
EXAMPLE
Some solutions for n=3:
..0..1....1..3....1..3....3..2....3..0....3..3....1..3....1..0....2..1....0..0
..2..0....0..1....3..3....3..1....1..0....1..0....0..1....3..1....3..3....2..0
..0..3....0..3....1..2....3..3....0..2....1..3....3..0....3..0....1..3....0..3
..0..2....1..3....2..2....3..2....2..3....0..0....3..3....3..3....0..1....1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2014
STATUS
approved