OFFSET
1,1
COMMENTS
Row 6 of A208069.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 4*a(n-2) + 17*a(n-3) - 2*a(n-4) - 4*a(n-5) - 16*a(n-6) for n>8.
Empirical g.f.: 4*x*(4 + 56*x - 63*x^2 - 45*x^3 - 522*x^4 + 36*x^5 + 32*x^6 + 448*x^7) / ((1 - x)*(1 - 4*x)*(1 + x + x^2)*(1 + 2*x + 4*x^2)). - Colin Barker, Jun 27 2018
EXAMPLE
Some solutions for n=4:
..0..1..0..1....1..0..1..1....1..0..0..1....0..0..1..1....1..0..0..1
..0..0..1..0....0..1..0..0....0..1..1..0....0..1..0..0....0..1..1..0
..0..1..0..1....0..0..1..1....1..0..0..1....0..0..1..1....1..0..0..1
..0..0..1..0....0..1..0..0....0..1..1..0....0..1..0..0....0..0..1..0
..0..1..0..0....0..0..1..0....1..0..0..1....0..0..1..1....1..0..0..1
..0..0..1..0....0..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
STATUS
approved