OFFSET
1,1
COMMENTS
Row 7 of A188824.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 5*a(n-1) - 25*a(n-3) + 25*a(n-4) for n>5.
Empirical g.f.: 16*x*(8 - 36*x - 6*x^2 + 179*x^3 - 170*x^4) / ((1 - 5*x + 5*x^2)*(1 - 5*x^2)). - Colin Barker, Apr 30 2018
EXAMPLE
Some solutions for 7 X 3:
..1..1..1....0..1..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1
..0..1..1....1..0..1....1..1..1....1..0..0....1..1..1....1..1..1....1..1..1
..1..0..1....0..0..0....1..1..1....0..0..0....1..1..1....1..1..1....1..1..0
..0..1..0....0..0..0....1..1..1....0..0..0....1..1..1....1..1..0....1..0..1
..1..0..1....0..0..0....1..1..1....0..0..0....0..1..0....1..0..1....0..1..0
..0..1..0....0..0..0....0..1..0....0..0..0....1..0..0....0..0..0....1..0..1
..1..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2011
STATUS
approved