OFFSET
1,1
COMMENTS
Column 4 of A184694.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 61*a(n-1) - 266*a(n-2) + 416*a(n-3) - 256*a(n-4).
Empirical g.f.: 3*x*(9 - 37*x + 58*x^2 - 32*x^3) / (1 - 61*x + 266*x^2 - 416*x^3 + 256*x^4). - Colin Barker, Apr 14 2018
EXAMPLE
Some solutions for 3 X 4 with a(1,1)=0:
..0..0..1..0....0..2..0..1....0..2..0..0....0..1..0..0....0..2..2..1
..2..2..0..2....2..0..2..2....1..2..1..2....2..1..2..1....1..0..1..2
..0..2..0..1....1..2..0..0....2..1..2..1....2..1..0..2....2..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2011
STATUS
approved