OFFSET
1,1
COMMENTS
Column 3 of A186599
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..86
FORMULA
Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-4)-6*a(n-5)+3*a(n-6)+3*a(n-8)-3*a(n-9) for n>13
EXAMPLE
Some solutions for 5X6
..0..0..0..0..0..1....2..0..0..0..0..0....0..0..0..0..0..3....0..0..0..0..1..0
..0..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..0..2....0..0..0..0..0..1
..1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..2
..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..2..0..0..0..0..0....0..0..0..0..0..0....1..0..0..0..0..0....3..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2011
STATUS
approved