OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 11*a(n-1) - 41*a(n-2) + 65*a(n-3) - 43*a(n-4) + 9*a(n-5).
Empirical g.f.: x*(2 - 16*x + 39*x^2 - 35*x^3 + 9*x^4) / ((1 - x)*(1 - 3*x + x^2)*(1 - 7*x + 9*x^2)). - Colin Barker, Sep 28 2018
EXAMPLE
Some solutions for n=7:
..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0
..1..1....1..1....1..1....1..1....1..1....1..1....0..1....1..1....1..1....0..1
..1..1....0..0....0..0....2..2....2..2....1..1....1..2....2..2....1..1....1..0
..0..0....2..2....0..0....3..3....3..3....2..2....2..3....1..1....1..2....0..0
..0..2....2..1....1..1....3..3....2..2....2..2....3..3....0..0....2..1....0..0
..2..2....1..1....1..1....0..0....3..3....2..1....0..0....3..3....1..0....0..0
..2..2....1..1....2..2....0..0....1..1....1..3....1..1....3..3....0..0....0..0
..2..2....0..0....3..3....0..0....3..3....3..3....3..3....0..0....3..3....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 09 2013
STATUS
approved