OFFSET
1,1
COMMENTS
Column 3 of A183402.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 5*a(n-1) - 23*a(n-3) + 15*a(n-4) + 40*a(n-5) - 46*a(n-6) + 20*a(n-8) - 8*a(n-9) for n>10.
Empirical g.f.: 2*x*(2 - 9*x - 2*x^2 + 47*x^3 - 32*x^4 - 76*x^5 + 90*x^6 - 40*x^8 + 16*x^9) / ((1 - 5*x + 5*x^2 - 2*x^3)*(1 - 5*x^2 + 10*x^4 - 4*x^6)). - Colin Barker, Mar 28 2018
EXAMPLE
Some solutions with a(1,1)=0 for 4 X 3:
..0..1..0....0..0..0....0..1..0....0..0..0....0..1..0....0..0..0....0..1..0
..1..1..0....1..1..1....0..1..0....1..1..1....0..1..0....1..1..1....0..1..1
..0..0..0....0..0..1....1..0..0....1..0..1....0..1..1....0..1..1....1..0..0
..1..1..1....1..0..1....1..0..1....1..0..1....0..0..0....0..0..0....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2011
STATUS
approved