OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 5*a(n-1) -9*a(n-2) +6*a(n-3) -6*a(n-7) +9*a(n-8) -5*a(n-9) +a(n-10).
Empirical g.f.: x*(4 - 7*x + 6*x^2 - 6*x^6 + 9*x^7 - 5*x^8 + x^9) / ((1 - x)^7*(1 + x)*(1 + x + x^2)). - Colin Barker, Jan 09 2019
EXAMPLE
Some solutions for n=4:
..0..0..1....0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..0
..0..0..1....0..0..1....0..1..1....0..1..0....0..1..1....0..0..1....0..0..0
..0..1..0....0..1..1....1..1..1....0..1..0....1..0..1....0..0..1....0..1..1
..1..0..1....1..1..0....1..1..1....1..0..1....1..1..1....0..1..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2015
STATUS
approved