OFFSET
1,1
COMMENTS
Column 2 of A183501.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 4*a(n-1) + 4*a(n-2) - 16*a(n-3) + 16*a(n-6) - 64*a(n-7) - 64*a(n-8) + 256*a(n-9)
Empirical g.f.: x*(3 - 3*x - 12*x^2 - 4*x^3 + 28*x^4 - 48*x^5 - 96*x^6 + 256*x^7 + 128*x^8) / ((1 - 2*x)*(1 + 2*x)*(1 - 4*x)*(1 - 4*x^3)*(1 + 4*x^3)). - Colin Barker, Mar 29 2018
EXAMPLE
Some solutions for 3 X 2:
..0..2....1..0....2..0....1..1....2..1....1..1....2..0....0..0....0..0....1..2
..2..1....2..1....0..0....1..1....0..0....1..2....0..0....1..2....1..1....0..0
..0..2....2..1....0..2....1..1....2..0....2..2....2..1....1..2....2..2....1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2011
STATUS
approved