OFFSET
1,1
COMMENTS
Column 7 of A235954
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-4) for n>15
EXAMPLE
Some solutions for n=5
..1..2..1..0..0..2..0..0....2..0..1..2..0..0..0..2....1..0..1..2..1..0..2..1
..0..0..2..1..0..1..2..0....0..0..2..1..0..1..2..1....2..0..0..0..2..0..0..0
..1..0..1..2..0..0..0..2....1..2..0..0..0..2..0..0....1..2..1..0..1..2..1..0
..2..0..0..0..2..1..0..1....2..1..0..1..2..1..0..1....0..0..2..0..0..0..2..0
..1..2..1..0..1..2..0..0....0..0..0..2..0..0..0..2....2..0..1..2..1..0..1..2
..1..1..2..0..0..1..2..1....0..1..2..1..0..1..2..0....2..0..0..1..2..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2014
STATUS
approved