OFFSET
1,1
COMMENTS
Column 6 of A188866.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 243*n - 265 for n>3.
Empirical g.f.: x*(64 + 111*x + 52*x^2 + 14*x^3 + 2*x^4) / (1 - x)^2. - Colin Barker, May 01 2018
EXAMPLE
Some solutions for 3 X 6:
..1..1..1..0..1..1....1..0..0..0..0..0....1..1..1..1..1..0....1..1..1..1..1..1
..0..0..0..0..0..0....0..0..0..0..0..0....1..0..1..0..0..0....0..1..1..1..1..1
..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 12 2011
STATUS
approved