OFFSET
1,2
COMMENTS
Column 3 of A221408
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 36*a(n-2) -200*a(n-4) -40*a(n-6) -84*a(n-8) +80*a(n-10) -20*a(n-12) +80*a(n-14)
EXAMPLE
Some solutions for n=4
..0..2..0....2..0..2....2..0..2....0..2..0....0..2..0....2..0..0....0..2..2
..2..0..0....2..0..0....0..0..2....0..0..2....0..2..0....0..2..2....0..0..0
..2..2..2....0..0..2....0..0..2....2..2..2....2..0..2....0..0..0....2..0..2
..0..2..0....2..2..0....2..0..2....0..0..2....2..0..2....2..2..2....2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved