OFFSET
1,1
COMMENTS
Column 2 of A203452.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -4*a(n-2) -2*a(n-3) +5*a(n-4) -2*a(n-5).
Empirical g.f.: 2*x*(8 - 15*x + 4*x^2 + 11*x^3 - 6*x^4) / ((1 - x)^3*(1 + x)*(1 - 2*x)). - Colin Barker, Jun 04 2018
EXAMPLE
Some solutions for n=10:
..0..0..1....0..0..0....0..0..1....0..0..1....1..0..1....0..0..0....0..0..0
..0..0..1....0..0..0....0..0..1....0..0..1....0..1..0....0..0..1....0..0..0
..0..1..0....0..0..1....0..0..1....0..0..1....1..0..1....0..0..1....0..0..0
..1..0..1....0..1..0....0..0..1....0..0..1....0..1..0....0..0..1....0..0..0
..1..0..1....1..0..1....0..0..1....0..1..0....1..0..1....0..1..0....0..0..1
..1..0..1....0..1..0....0..1..0....0..1..0....0..1..0....1..0..1....0..1..1
..0..1..0....0..1..0....1..0..1....0..1..0....1..0..1....1..0..1....0..1..1
..0..1..0....1..1..0....0..1..1....0..1..0....0..1..1....0..1..0....1..1..0
..0..1..0....1..1..0....0..1..1....0..1..1....1..1..1....0..1..0....1..1..0
..0..1..0....1..1..0....1..1..1....0..1..1....1..1..1....0..1..0....1..1..0
..0..1..1....1..1..0....1..1..1....0..1..1....1..1..1....1..1..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2012
STATUS
approved