OFFSET
1,1
COMMENTS
Row 6 of A208501.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 7*a(n-2) - 11*a(n-3) - 4*a(n-4) + 4*a(n-5) for n>7.
Empirical g.f.: 19*x*(1 + 17*x - 21*x^2 - 96*x^3 + 113*x^4 + 52*x^5 - 40*x^6) / (1 - 2*x - 7*x^2 + 11*x^3 + 4*x^4 - 4*x^5). - Colin Barker, Jul 03 2018
EXAMPLE
Some solutions for n=4:
..1..0..1..0....1..1..0..0....1..1..1..0....1..1..1..1....0..1..0..0
..1..1..0..1....1..0..1..0....1..0..1..0....1..0..1..0....0..1..0..1
..0..1..1..1....0..1..1..1....0..1..0..0....0..1..0..0....1..0..1..1
..1..0..1..0....1..1..0..1....0..1..1..0....0..1..0..0....1..1..1..0
..1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..0....0..1..0..1
..0..1..0..1....0..1..1..0....1..1..0..1....1..1..1..1....1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2012
STATUS
approved