OFFSET
1,1
COMMENTS
Column 3 of A268457.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 19*a(n-1) -156*a(n-2) +730*a(n-3) -2178*a(n-4) +4446*a(n-5) -6613*a(n-6) +7587*a(n-7) -6948*a(n-8) +5152*a(n-9) -3101*a(n-10) +1503*a(n-11) -573*a(n-12) +163*a(n-13) -31*a(n-14) +3*a(n-15)
EXAMPLE
Some solutions for n=9
..0....1....0....1....1....0....3....3....3....2....1....1....2....1....0....2
..1....2....2....0....1....1....0....2....0....2....0....0....0....2....0....2
..2....3....2....2....0....3....3....3....3....3....0....3....0....2....0....2
..3....0....0....2....2....0....0....3....3....0....2....3....1....0....2....2
..1....2....1....3....0....0....1....1....1....0....0....3....2....0....0....3
..3....3....3....3....0....2....3....3....1....1....1....1....2....3....0....1
..1....3....0....0....2....1....1....1....0....3....1....3....2....0....1....2
..2....0....0....2....0....1....1....1....0....3....3....1....3....0....2....0
..0....3....2....2....0....2....2....3....0....0....0....0....0....3....3....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2016
STATUS
approved