OFFSET
1,1
COMMENTS
Column 3 of A221139
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..29
FORMULA
Empirical: a(n) = 21*a(n-1) -1450*a(n-3) +4782*a(n-4) -372*a(n-5) +1450*a(n-6) +69*a(n-8) +a(n-9)
EXAMPLE
Some solutions for n=3
..2..1..1....1..2..0....0..2..2....2..1..0....0..2..2....0..1..2....0..2..2
..1..0..1....1..2..0....1..1..1....2..1..2....0..2..1....2..0..1....1..0..1
..0..2..1....1..2..0....0..1..1....0..0..1....0..2..0....2..1..0....2..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2013
STATUS
approved