OFFSET
1,1
COMMENTS
Column 3 of A202795.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) +2*a(n-2) +29*a(n-3) +16*a(n-4).
Empirical g.f.: 2*x*(2 + 11*x + 20*x^2 + 8*x^3) / (1 - 7*x - 2*x^2 - 29*x^3 - 16*x^4). - Colin Barker, Jun 01 2018
EXAMPLE
Some solutions for n=5:
..1..0..1....1..0..0....1..0..0....1..1..0....1..1..0....1..1..1....0..1..0
..1..1..0....0..1..0....1..1..0....1..0..1....1..0..1....1..0..0....0..1..1
..0..1..0....1..1..0....1..1..1....1..1..0....1..1..0....1..1..1....1..1..0
..1..1..0....0..1..0....0..1..0....1..1..0....1..1..1....1..1..0....1..1..0
..0..0..1....0..1..0....1..0..0....0..1..0....1..0..0....0..1..0....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 24 2011
STATUS
approved