OFFSET
1,1
COMMENTS
Column 2 of A254422
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 21*a(n-1) -139*a(n-2) +191*a(n-3) +1344*a(n-4) -4896*a(n-5) +1972*a(n-6) +10548*a(n-7) -8240*a(n-8) -8576*a(n-9) +4704*a(n-10) +3072*a(n-11) for n>17
EXAMPLE
Some solutions for n=3
..2..2..2....2..2..0....1..2..2....1..2..0....1..1..1....1..2..2....2..2..0
..0..2..1....0..2..0....0..2..2....2..2..0....2..2..2....1..2..2....1..2..2
..2..2..1....2..2..2....2..2..1....2..2..0....1..1..2....2..2..0....2..2..2
..0..0..1....2..2..2....0..2..2....2..1..2....1..0..2....0..1..1....0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 30 2015
STATUS
approved