OFFSET
1,1
COMMENTS
Column 3 of A202802.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) -3*a(n-2) +19*a(n-3) -3*a(n-4) +25*a(n-5) +24*a(n-6) -22*a(n-7) -16*a(n-8).
Empirical g.f.: 2*x*(2 + 4*x + 5*x^2 + 20*x^4 + 7*x^5 - 16*x^6 - 8*x^7) / (1 - 7*x + 3*x^2 - 19*x^3 + 3*x^4 - 25*x^5 - 24*x^6 + 22*x^7 + 16*x^8). - Colin Barker, Jun 01 2018
EXAMPLE
Some solutions for n=5:
..0..0..0....0..1..0....0..0..1....0..1..1....0..1..1....0..0..1....0..0..0
..1..0..0....1..1..1....0..0..1....0..1..0....0..0..1....0..0..1....1..0..0
..1..0..0....0..0..1....1..0..1....1..0..0....1..1..0....0..1..0....1..1..1
..0..1..1....0..1..0....1..1..1....1..1..1....0..0..0....0..1..1....1..1..1
..0..1..0....0..1..1....0..1..0....0..0..1....0..1..1....0..0..1....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 24 2011
STATUS
approved