OFFSET
1,1
COMMENTS
Column 2 of A184071.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Conjectures from Colin Barker, Apr 11 2018: (Start)
G.f.: x*(11 - 28*x + 38*x^2 - 19*x^3 + 5*x^4 - x^5 + 2*x^6) / (1 - x)^4.
a(n) = (4*n^3 - 15*n^2 + 74*n - 93) / 3 for n>3.
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n>7.
(End)
EXAMPLE
Some solutions for 4 X 3:
..0..0..1....1..1..1....0..0..0....0..0..1....0..0..0....0..1..1....0..1..1
..0..1..0....1..1..1....0..0..1....0..1..0....0..0..0....1..0..1....1..0..1
..1..0..1....1..1..1....0..1..0....0..1..1....0..0..0....1..0..1....1..0..1
..1..1..1....1..1..1....0..1..0....1..1..0....0..0..0....1..1..0....1..1..1
...
...1..2.......4..4.......0..1.......1..2.......0..0.......2..3.......2..3...
...2..2.......4..4.......1..2.......2..3.......0..0.......2..2.......2..2...
...3..3.......4..4.......2..2.......3..3.......0..0.......3..2.......3..3...
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 09 2011
STATUS
approved