OFFSET
1,2
COMMENTS
Column 1 of A210086.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 17*a(n-1) - 71*a(n-2) + 67*a(n-3) - 8*a(n-4) - 4*a(n-5).
Empirical g.f.: x*(1 + 34*x - 34*x^2 + 5*x^3 + 2*x^4) / ((1 - x)*(1 - 5*x + 2*x^2)*(1 - 11*x - 2*x^2)). - Colin Barker, Jul 14 2018
EXAMPLE
Some solutions for n=4:
..0..0....0..1....0..0....0..0....0..0....0..0....0..0....0..1....0..0....0..0
..1..2....1..2....0..0....0..0....1..2....0..0....0..0....0..2....0..0....1..2
..0..1....2..3....0..0....0..0....3..1....1..2....0..0....2..3....0..0....2..3
..1..3....1..1....1..2....1..2....1..0....1..3....1..2....1..2....1..2....2..1
..3..0....0..3....2..3....3..2....0..2....0..0....3..1....1..3....0..3....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2012
STATUS
approved