OFFSET
1,1
COMMENTS
Column 2 of A206255.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 19*a(n-1) - 855*a(n-3) + 2025*a(n-4).
Empirical g.f.: x*(361 + 1170*x - 52695*x^2 + 129600*x^3) / ((1 - 19*x + 45*x^2)*(1 - 45*x^2)). - Colin Barker, Jun 14 2018
EXAMPLE
Some solutions for n=4:
..0..2..3....0..2..0....0..0..3....3..0..1....1..2..2....0..3..3....2..3..0
..0..0..0....0..0..0....1..0..1....0..0..1....0..0..0....0..0..0....0..0..0
..1..1..1....1..3..2....0..0..3....0..0..1....1..1..1....1..0..0....3..3..3
..0..0..0....0..0..0....2..0..3....1..0..0....0..0..0....1..0..3....0..0..0
..3..1..3....1..0..1....2..0..1....3..0..1....0..0..2....2..0..1....1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2012
STATUS
approved