OFFSET
1,1
COMMENTS
Column 7 of A208780.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) for n>4.
Empirical g.f.: 42*x*(1 + 41*x - 37*x^2 - 38*x^3) / (1 - x - x^2). - Colin Barker, Jul 06 2018
EXAMPLE
Some solutions for n=4:
..1..0..1..0..1..0..1....1..1..1..0..1..0..0....1..1..0..1..0..1..0
..0..1..0..1..0..1..1....1..0..1..0..1..0..0....1..0..1..0..1..0..1
..1..0..1..0..1..0..0....0..1..0..1..0..1..1....0..1..0..1..0..1..0
..0..1..0..1..0..1..1....1..0..1..0..1..0..0....1..0..1..0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved