OFFSET
1,1
COMMENTS
Column 1 of A205998.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 5*a(n-2) + 3*a(n-3) - 2*a(n-4) + a(n-5).
Empirical g.f.: 2*x*(13 + 20*x + 8*x^2 - 7*x^3 + 4*x^4) / (1 - 2*x - 5*x^2 - 3*x^3 + 2*x^4 - x^5). - Colin Barker, Jun 13 2018
EXAMPLE
Some solutions for n=4:
..1..0....1..2....2..2....1..1....2..0....2..0....2..1....1..2....2..0....0..1
..2..1....1..0....1..0....0..2....1..2....1..2....0..2....0..1....0..1....2..2
..1..2....2..1....2..1....1..0....0..1....1..0....1..0....2..2....2..2....1..0
..2..1....0..2....1..2....2..1....1..2....0..1....2..1....1..0....1..0....2..1
..1..2....2..1....0..2....0..2....1..0....1..0....1..0....2..1....0..2....0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2012
STATUS
approved