OFFSET
1,1
COMMENTS
Column 2 of A188105.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1)-a(n-2)+a(n-4)-2*a(n-5)+a(n-6)+a(n-8)-a(n-9) for n>14.
Empirical g.f.: x*(708 - 1273*x + 665*x^2 + 300*x^3 - 269*x^4 + 1326*x^5 - 1065*x^6 - 548*x^7 - 1179*x^8 + 520*x^9 + 372*x^10 + 245*x^11 + 113*x^12 + 64*x^13) / ((1 - x)*(1 - x - x^4 + x^5 - x^8)). - Colin Barker, Feb 07 2018
EXAMPLE
Some solutions for 7 X 5:
..0..0..0..0..1....0..0..0..0..0....1..1..1..1..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..1..1....0..0..0..0..0....1..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..1..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..1..0..0
..1..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..1..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..0..0..1
..1..0..0..0..0....0..1..1..0..0....1..0..1..0..0....0..1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2011
STATUS
approved