OFFSET
1,1
COMMENTS
Row 5 of A208840.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 12*a(n-2) - 11*a(n-3).
Empirical g.f.: 14*x*(1 + 12*x - 11*x^2) / (1 - 2*x - 12*x^2 + 11*x^3). - Colin Barker, Jul 07 2018
EXAMPLE
Some solutions for n=4:
..1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..1....0..1..0..0
..1..0..1..1....1..1..1..1....1..0..1..1....0..1..0..1....0..1..1..0
..1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..1....1..1..0..0
..1..0..1..0....1..1..1..1....1..0..1..1....0..1..0..1....0..1..1..1
..1..1..0..1....1..0..1..0....1..1..1..1....1..0..1..1....1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved