OFFSET
1,1
COMMENTS
Column 2 of A183397.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) - 3*a(n-2) + 6*a(n-3) - 6*a(n-5) + 3*a(n-6) - 3*a(n-7) + a(n-8) for n>11.
Empirical g.f.: 2*x*(1 + x - 5*x^2 - 2*x^3 - 20*x^4 - 14*x^5 + 13*x^6 + 19*x^7 - x^8 + 8*x^9 - 4*x^10) / ((1 - x)*(1 + x)*(1 - 3*x + x^2)*(1 + 3*x^2 + x^4)). - Colin Barker, Mar 28 2018
EXAMPLE
Some solutions with a(1,1)=0 for 10 X 2:
..0..1....0..1....0..0....0..1....0..0....0..0....0..0....0..1....0..1....0..0
..0..1....0..0....1..1....1..0....1..0....0..0....0..0....0..1....1..1....1..1
..0..1....0..1....1..1....0..1....1..1....1..1....1..1....0..1....0..1....1..1
..0..1....1..1....0..0....1..0....1..0....1..1....1..1....0..1....0..0....0..0
..1..0....0..1....0..0....0..1....0..1....1..0....1..0....1..1....1..1....1..1
..0..1....0..0....1..0....1..0....1..0....0..0....1..0....0..1....1..0....1..1
..1..0....0..1....1..0....0..0....0..1....0..0....1..0....1..0....0..0....0..0
..0..1....1..0....1..0....1..0....1..0....1..1....1..0....1..1....1..1....1..1
..1..0....0..1....1..0....1..1....0..1....1..1....1..0....1..0....1..1....1..1
..0..1....1..0....1..0....1..0....1..0....0..0....1..0....0..0....0..0....0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2011
STATUS
approved