OFFSET
1,1
COMMENTS
Column 1 of A203965.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-1) -40*a(n-2) +82*a(n-3) -91*a(n-4) +52*a(n-5) -12*a(n-6).
Empirical g.f.: x*(32 - 199*x + 517*x^2 - 675*x^3 + 432*x^4 - 108*x^5) / ((1 - x)^3*(1 - 2*x)^2*(1 - 3*x)). - Colin Barker, Jun 06 2018
EXAMPLE
Some solutions for n=4:
..1..2....2..0....0..0....1..1....0..2....0..2....1..2....2..1....2..1....2..2
..1..2....0..2....2..2....1..1....0..2....1..1....1..2....1..2....1..2....2..2
..1..2....2..0....2..2....0..2....2..0....1..1....2..1....2..2....2..1....2..2
..1..2....0..2....2..2....2..1....0..2....0..2....1..2....2..2....1..2....2..2
..1..2....1..1....2..2....2..1....1..2....1..2....2..1....2..2....2..1....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2012
STATUS
approved