OFFSET
1,1
COMMENTS
Column 3 of A188874
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 7*a(n-1) -3*a(n-2) -5*a(n-3) +2*a(n-4)
EXAMPLE
Some solutions for 4X3
..0..1..1....1..0..1....0..1..0....1..1..1....1..0..0....0..1..1....0..0..1
..1..0..1....0..1..0....1..1..0....1..0..1....1..1..0....1..1..1....0..1..0
..1..1..0....0..1..1....0..1..1....1..0..0....0..1..0....1..1..1....0..1..1
..1..1..0....0..1..1....1..1..0....1..1..1....1..0..0....0..0..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 12 2011
STATUS
approved