OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) + 19*a(n-2) - 27*a(n-3) - 55*a(n-4) + 37*a(n-5).
Empirical g.f.: 2*x*(50 + 108*x - 253*x^2 - 389*x^3 + 295*x^4) / (1 - 5*x - 19*x^2 + 27*x^3 + 55*x^4 - 37*x^5). - Colin Barker, Oct 11 2018
EXAMPLE
Some solutions for n=4:
..1..1....3..2....1..0....1..2....1..3....0..1....3..3....3..3....1..1....0..1
..0..3....2..0....3..0....0..3....1..0....3..3....2..0....0..0....0..3....1..3
..1..3....3..3....3..3....0..3....3..0....0..1....3..2....0..3....1..3....3..2
..3..2....0..0....0..2....2..3....3..0....3..1....1..0....0..1....0..2....1..0
..0..2....0..3....2..3....0..1....3..2....1..2....3..1....0..3....0..3....2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2013
STATUS
approved