OFFSET
1,1
COMMENTS
Column 1 of A235555.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 4*a(n-2) - 8*a(n-3) - 4*a(n-4) + 8*a(n-5).
Empirical g.f.: 2*x*(8 + 7*x - 18*x^2 - 4*x^3 + 18*x^4) / ((1 - 2*x)*(1 - 2*x^2)^2). - Colin Barker, Mar 19 2018
EXAMPLE
Some solutions for n=5:
..0..1....0..0....1..0....1..1....1..0....1..1....0..0....1..1....0..1....0..0
..1..1....1..1....1..0....1..0....1..0....1..0....1..1....1..0....1..0....0..0
..0..1....0..0....0..1....1..0....0..1....1..1....0..0....1..1....1..0....0..0
..1..1....0..0....0..1....1..0....0..1....1..0....0..0....0..1....0..0....0..0
..0..0....0..0....0..0....1..0....0..1....1..1....1..1....0..1....1..0....0..0
..0..0....1..1....1..0....0..0....1..0....0..0....1..1....0..1....0..0....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2014
STATUS
approved