OFFSET
1,1
COMMENTS
Column 5 of A188866.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 81*n - 65 for n>2.
Empirical g.f.: x*(32 + 35*x + 12*x^2 + 2*x^3) / (1 - x)^2. - Colin Barker, May 01 2018
EXAMPLE
Some solutions for 3 X 5:
..1..1..1..1..0....1..1..1..1..1....1..1..1..1..1....1..1..1..1..1
..1..0..0..0..0....1..1..0..1..1....0..1..1..1..1....1..1..1..1..1
..0..0..0..0..0....0..0..0..0..0....0..0..1..0..1....0..1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 12 2011
STATUS
approved