OFFSET
1,1
COMMENTS
Column 5 of A183688.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 18*a(n-2) - 20*a(n-3) - 72*a(n-4).
Empirical g.f.: 16*x*(6 + 15*x - 39*x^2 - 94*x^3) / ((1 + 2*x)*(1 - 5*x - 8*x^2 + 36*x^3)). - Colin Barker, Apr 04 2018
EXAMPLE
Some solutions for 3 X 6:
..0..1..1..0..1..0....1..0..1..1..0..1....0..1..0..1..0..1....1..1..0..1..1..0
..1..0..1..1..1..1....0..1..0..1..1..0....1..1..1..1..1..0....1..0..1..0..1..1
..0..1..1..0..1..0....1..0..1..0..1..1....0..1..0..1..0..1....0..1..1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved