OFFSET
1,1
COMMENTS
Column 1 of A206267.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 5*a(n-2) + a(n-3) + 2*a(n-4) - a(n-5) for n>6.
Empirical g.f.: x*(16 - 40*x + 18*x^2 + 18*x^3 - 14*x^4 + x^5) / ((1 - x)^3*(1 - x - x^2)). - Colin Barker, Jun 14 2018
EXAMPLE
Some solutions for n=4:
..0..0....0..1....0..1....1..1....1..0....1..1....0..0....1..1....0..0....1..0
..0..1....1..0....1..0....0..0....0..0....1..1....1..0....1..0....0..0....1..1
..1..0....0..1....0..1....0..0....0..0....1..1....1..1....0..0....0..0....0..1
..0..1....1..0....0..1....0..0....0..0....1..0....0..1....0..0....0..0....0..0
..1..0....0..1....1..0....0..0....0..0....1..0....0..0....0..0....0..0....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2012
STATUS
approved