OFFSET
1,1
COMMENTS
Column 7 of A237637
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..0..0..2..1..0..1..1....0..2..1..0..1..2..0..0....0..0..1..2..0..0..0..2
..2..1..0..1..2..0..0..0....0..1..2..0..0..0..2..1....1..0..2..1..0..1..2..0
..1..2..0..0..0..2..1..0....0..0..0..2..1..0..1..2....0..2..0..0..0..2..1..0
..0..0..2..1..0..1..2..0....2..1..0..1..2..0..0..0....2..1..0..1..2..0..0..0
..1..0..1..2..0..0..0..2....1..2..0..0..0..2..1..0....0..0..0..2..1..0..1..2
..1..0..0..0..2..1..0..1....1..0..2..1..0..1..2..0....0..1..2..0..0..0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2014
STATUS
approved