OFFSET
1,1
COMMENTS
Column 1 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*(7 - 17*x + 18*x^2 - 8*x^3 + x^4) / (1 - x)^4.
a(n) = (n^3 + 6*n^2 + 5*n + 24) / 6 for n>1.
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n>5.
(End)
EXAMPLE
Some solutions for 3 X 2:
..0..0....0..1....0..0....0..1....0..0....0..1....0..0....0..1....0..1....0..1
..0..1....0..1....0..0....1..1....0..0....1..0....0..1....0..1....1..0....0..1
..1..0....1..0....0..1....1..1....0..0....1..1....0..1....1..1....1..0....0..1
...
...1.......2.......0.......3.......0.......2.......1.......2.......2.......2...
...2.......2.......1.......4.......0.......3.......2.......3.......2.......2...
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 09 2011
STATUS
approved