OFFSET
1,1
COMMENTS
Column 3 of A184773
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n)=36*a(n-1)-51*a(n-2)-7976*a(n-3)+65448*a(n-4)+105984*a(n-5)-2142720*a(n-6)+4230144*a(n-7)
EXAMPLE
Some solutions for 3X4
..2..1..3..3....3..1..2..2....2..0..3..1....1..1..3..1....2..1..1..2
..0..0..0..0....0..0..0..0....1..0..0..0....0..0..0..0....0..0..0..0
..3..1..2..2....2..0..0..2....1..0..2..2....2..0..0..3....0..1..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2011
STATUS
approved