OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-2) +2*a(n-4) for n>6
Empirical: a(2k)=14*2^k for k>1
EXAMPLE
Some solutions for n=8
..1..1....1..1....1..1....0..0....0..1....0..0....1..1....1..0....0..1....1..0
..1..0....0..1....1..0....0..1....1..0....1..1....1..0....1..0....1..0....0..1
..1..0....0..1....1..0....1..1....1..0....0..1....1..0....1..1....1..0....0..1
..1..1....1..1....0..1....1..1....0..1....0..1....0..1....1..1....1..1....1..0
..1..1....1..1....0..1....1..0....0..1....1..1....0..1....1..0....1..1....1..0
..0..1....0..1....1..1....1..0....1..1....1..1....1..1....1..0....0..1....0..1
..0..1....0..1....1..1....0..1....1..1....0..1....1..1....1..1....0..1....0..1
..1..0....1..0....0..1....0..1....0..1....0..1....1..0....1..1....1..1....1..1
..1..0....0..0....0..1....1..0....0..0....1..1....0..0....1..0....0..0....0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 16 2012
STATUS
approved