OFFSET
1,1
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*(40 - 91*x + 32*x^2 + 46*x^3 - 29*x^4 + x^5) / ((1 - x)^3*(1 - x - x^2)). - Colin Barker, Nov 25 2018
EXAMPLE
Some solutions for n=4:
..1..0..1..1....1..0..0..1....0..0..1..0....0..0..0..1....1..1..1..1
..1..0..1..0....1..0..0..0....0..0..1..0....1..1..1..1....0..0..0..0
..1..0..1..0....1..0..0..0....0..0..1..0....0..0..0..0....1..0..0..0
..1..0..1..0....1..0..0..0....0..0..1..0....0..0..0..0....1..0..0..0
..1..0..1..0....1..0..0..0....0..0..1..0....1..0..0..0....1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 30 2014
STATUS
approved