OFFSET
1,1
COMMENTS
Column 1 of A186052.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 5*a(n-1) + 4*a(n-2) + 18*a(n-3) - 40*a(n-4) - 24*a(n-5) - 72*a(n-6).
Empirical g.f.: 2*x*(169 + 174*x + 368*x^2 - 1412*x^3 - 1056*x^4 - 2304*x^5) / (1 - 5*x - 4*x^2 - 18*x^3 + 40*x^4 + 24*x^5 + 72*x^6). - Colin Barker, Apr 17 2018
EXAMPLE
Some solutions for 4 X 3:
..1..1..0....0..0..0....1..1..0....0..1..0....0..0..0....0..0..1....1..1..1
..0..0..0....0..1..0....1..1..0....1..1..0....0..1..1....0..1..1....0..0..0
..0..1..0....0..0..0....1..0..0....0..0..0....0..0..0....0..1..1....1..1..0
..1..1..1....0..0..1....0..1..0....1..0..0....0..0..0....0..0..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 11 2011
STATUS
approved