OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 4*a(n-3) + 5*a(n-4) + 3*a(n-5) + 5*a(n-6) + a(n-7) - 4*a(n-8) - a(n-9) + a(n-10) for n>11.
Empirical g.f.: 2*x*(31 + 37*x + 119*x^2 + 123*x^3 + 80*x^4 + 106*x^5 + 27*x^6 - 76*x^7 - 30*x^8 + 16*x^9 + 3*x^10) / (1 - x - 4*x^3 - 5*x^4 - 3*x^5 - 5*x^6 - x^7 + 4*x^8 + x^9 - x^10). - Colin Barker, Dec 26 2018
EXAMPLE
Some solutions for n=4:
..0..0..0..1..0..1....0..0..1..0..1..0....1..0..1..0..1..0....0..1..0..1..0..1
..1..0..1..0..1..0....0..0..0..1..0..0....0..0..0..1..0..1....1..0..1..0..1..0
..0..1..0..1..0..1....1..0..1..0..1..0....1..0..1..0..0..0....0..0..0..1..0..1
..1..0..1..0..1..0....0..1..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0
..0..1..0..1..0..1....1..0..1..0..0..0....1..0..1..0..1..0....0..1..0..1..0..0
..1..0..1..0..1..0....0..1..0..1..0..0....0..1..0..1..0..0....0..0..1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 04 2015
STATUS
approved