OFFSET
1,1
COMMENTS
Column 2 of A189312.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 4*a(n-1) +8*a(n-2) -4*a(n-4) +a(n-5).
Empirical g.f.: x*(2 + 2*x - x^2)*(1 + 2*x - x^2) / (1 - 4*x - 8*x^2 + 4*x^4 - x^5). - Colin Barker, May 01 2018
EXAMPLE
Some solutions for 3 X 2:
..3..1....0..3....0..1....1..3....0..1....0..1....0..1....3..1....1..0....0..1
..2..0....2..1....2..3....0..2....4..3....5..2....4..3....4..0....3..5....3..2
..4..5....4..5....5..4....5..4....2..5....4..3....5..2....2..5....2..4....4..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 19 2011
STATUS
approved