OFFSET
1,1
COMMENTS
Column 3 of A205226.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +12*a(n-2) -11*a(n-3) -47*a(n-4) +40*a(n-5) +64*a(n-6) -48*a(n-7) -8*a(n-8) for n>9.
Empirical g.f.: 4*x*(13 + 20*x - 107*x^2 - 129*x^3 + 302*x^4 + 237*x^5 - 284*x^6 - 52*x^7 + 16*x^8) / (1 - x - 12*x^2 + 11*x^3 + 47*x^4 - 40*x^5 - 64*x^6 + 48*x^7 + 8*x^8). - Colin Barker, Jun 11 2018
EXAMPLE
Some solutions for n=4:
..0..0..0..0....0..1..1..1....0..1..0..1....0..1..1..0....0..0..1..0
..0..1..1..0....0..1..0..0....0..1..1..0....0..0..0..1....1..0..1..1
..1..0..1..0....0..0..1..0....0..0..0..0....1..1..0..1....0..1..1..1
..1..1..0..0....1..1..1..0....1..1..0..0....0..1..0..0....0..0..0..1
..1..1..0..0....1..0..0..0....1..0..1..0....0..1..1..1....1..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 23 2012
STATUS
approved