OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 47*a(n-1) - 485*a(n-2) + 1429*a(n-3) - 1056*a(n-4) + 208*a(n-5) - 40*a(n-6).
Empirical g.f.: 8*x*(313 - 3702*x + 11300*x^2 - 8422*x^3 + 1659*x^4 - 320*x^5) / (1 - 47*x + 485*x^2 - 1429*x^3 + 1056*x^4 - 208*x^5 + 40*x^6). - Colin Barker, Oct 16 2018
EXAMPLE
Some solutions for n=2:
..3..1..0....0..1..2....0..2..0....0..2..2....1..0..2....3..2..3....1..0..2
..0..1..1....1..2..2....1..3..1....1..3..3....3..3..1....2..1..2....2..0..0
..1..3..0....1..2..0....1..2..3....0..1..1....0..3..1....2..2..3....3..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2013
STATUS
approved