OFFSET
1,2
COMMENTS
Row 3 of A219002.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..42
FORMULA
Empirical: a(n) = 7*a(n-1) - 3*a(n-2) + 49*a(n-3) + 45*a(n-4) - 17*a(n-5) - 15*a(n-6).
Empirical g.f.: x*(1 + 29*x + 79*x^2 + 28*x^3 - 32*x^4 - 15*x^5) / (1 - 7*x + 3*x^2 - 49*x^3 - 45*x^4 + 17*x^5 + 15*x^6). - Colin Barker, Jul 25 2018
EXAMPLE
Some solutions for n=3:
..1..1..0....0..0..1....0..1..0....1..1..1....0..0..1....1..1..0....0..0..0
..0..0..1....0..1..1....0..0..0....1..0..0....1..0..0....1..0..1....1..1..1
..1..1..0....1..0..0....0..0..0....1..1..1....1..0..0....0..1..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 09 2012
STATUS
approved