OFFSET
1,1
COMMENTS
Column 8 of A183642
FORMULA
Empirical: a(n)=10*a(n-1)-35*a(n-2)+50*a(n-3)-24*a(n-4)
EXAMPLE
Some solutions for 3X9
..2..0..2..2..0..0..3..0..2....0..2..3..0..3..0..2..2..3
..1..3..1..1..3..3..0..3..1....3..1..0..3..0..3..1..1..0
..2..0..2..2..0..0..3..0..2....0..2..3..0..3..0..2..2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 06 2011
STATUS
approved