OFFSET
1,1
COMMENTS
Column 1 of A184477.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 96*a(n-3) - 288*a(n-4) - 2700*a(n-6) + 8100*a(n-7) + 23328*a(n-9) - 69984*a(n-10).
Empirical g.f.: 3*x*(105 + 50*x + 140*x^2 - 9672*x^3 - 1944*x^4 - 5112*x^5 + 269028*x^6 + 17496*x^7 + 42768*x^8 - 2332800*x^9) / ((1 - 3*x)*(1 - 18*x^3)*(1 - 24*x^3)*(1 - 54*x^3)). - Colin Barker, Apr 12 2018
EXAMPLE
Some solutions with a(1,1)=0 for 4 X 3:
..0..2..2....0..1..2....0..2..0....0..0..2....0..1..2....0..1..2....0..2..1
..2..0..1....1..2..1....0..2..0....2..0..2....1..2..1....0..2..0....1..1..2
..0..2..0....2..1..2....2..1..2....2..1..0....2..1..2....2..2..0....1..2..2
..0..2..2....2..0..1....0..2..0....0..0..2....1..0..2....0..1..2....2..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2011
STATUS
approved