OFFSET
1,1
COMMENTS
Row 6 of A208108.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 21*a(n-3) + 438*a(n-4) - 456*a(n-5) - 399*a(n-6) - 7220*a(n-8) + 6859*a(n-9).
Empirical g.f.: x*(22 + 440*x + 22*x^2 - 417*x^3 - 855*x^4 - 7619*x^5 - 361*x^6 - 361*x^7 + 6859*x^8) / ((1 - 2*x - 20*x^2 + 19*x^3)*(1 + 20*x^2 - 38*x^4 - 361*x^6)). - Colin Barker, Jun 28 2018
EXAMPLE
Some solutions for n=5:
..1..1..1..0..0....0..0..1..1..0....0..1..1..0..0....1..1..1..1..0
..1..1..1..0..0....0..0..1..1..1....1..1..1..0..1....1..1..1..0..1
..1..1..1..1..1....1..1..1..1..0....0..1..1..1..0....1..1..1..0..0
..1..1..1..0..0....0..0..1..1..0....0..1..1..0..0....1..1..1..0..0
..1..1..1..1..1....1..1..1..1..0....1..1..1..1..0....1..1..1..0..1
..1..1..1..0..0....0..0..1..1..1....0..1..1..0..1....1..1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
STATUS
approved