OFFSET
1,2
COMMENTS
Column 1 of A185497.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 3*a(n-2) - 14*a(n-3) + 24*a(n-4) - 16*a(n-5) - 24*a(n-6) + 16*a(n-7) - 64*a(n-8).
Empirical g.f.: 4*x^2*(6 - 9*x - 5*x^2 + 32*x^3 - 90*x^4 + 60*x^5 - 96*x^6) / ((1 - 2*x)*(1 - x - 5*x^2 + 4*x^3 - 16*x^4 - 16*x^5 - 8*x^6 - 32*x^7)). - Colin Barker, Feb 27 2018
EXAMPLE
Some solutions for 4 X 2:
..0..1....1..1....1..0....0..1....0..0....0..1....0..1....0..0....1..1....1..0
..0..1....0..1....1..0....1..1....0..0....0..0....0..1....1..1....1..1....0..0
..1..0....1..1....1..0....1..0....0..0....1..0....0..1....0..0....1..1....1..0
..0..1....0..1....0..1....1..1....0..0....0..0....1..0....1..1....1..1....0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2011
STATUS
approved