OFFSET
1,1
COMMENTS
Column 4 of A189264
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 9*a(n-1) -9*a(n-2) -27*a(n-3) +62*a(n-4) -522*a(n-5) +730*a(n-6) +2202*a(n-7) -3620*a(n-8) +5768*a(n-9) -7920*a(n-10) -45696*a(n-11) +71680*a(n-12) +75424*a(n-13) -146112*a(n-14) +13984*a(n-15) +51072*a(n-16) -17024*a(n-17) for n>18
EXAMPLE
Some solutions for 4X3
..0..1..0....1..1..1....0..1..0....1..1..1....0..0..0....1..1..0....1..0..0
..1..1..1....0..1..0....1..1..1....0..1..0....1..1..0....1..1..1....0..1..1
..1..1..1....1..1..1....1..1..0....1..1..1....0..0..0....1..1..0....0..1..0
..0..1..1....0..1..1....1..1..0....0..0..1....1..1..0....0..1..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 19 2011
STATUS
approved