OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) + 12*a(n-2) - 60*a(n-3) - 39*a(n-4) + 195*a(n-5) + 28*a(n-6) - 140*a(n-7).
Empirical g.f.: x*(2 + 23*x - 47*x^2 - 91*x^3 + 193*x^4 + 28*x^5 - 140*x^6) / ((1 - x)*(1 + x)*(1 - 2*x)*(1 + 2*x)*(1 - 5*x)*(1 - 7*x^2)). - Colin Barker, Jan 01 2019
EXAMPLE
Some solutions for n=4:
..1..0..1....0..0..1....1..0..0....1..0..0....1..0..1....1..0..1....1..0..0
..1..1..1....1..0..0....0..1..0....0..1..0....1..0..1....0..0..1....1..0..1
..1..1..1....1..1..1....1..1..1....0..1..0....0..0..1....1..1..1....0..1..0
..1..1..1....0..0..1....1..0..0....0..1..0....0..1..0....1..0..0....0..0..1
..1..0..1....1..1..1....0..1..0....1..0..1....1..0..0....0..0..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 08 2015
STATUS
approved