OFFSET
1,1
COMMENTS
Column 2 of A209848.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 22*a(n-1) - 127*a(n-2) + 90*a(n-3) + 288*a(n-4) - 400*a(n-5) + 128*a(n-6).
Empirical g.f.: x*(41 - 451*x + 368*x^2 + 1324*x^3 - 1936*x^4 + 640*x^5) / ((1 - x)*(1 - 8*x)*(1 - 13*x + 2*x^2 + 32*x^3 - 16*x^4)). - Colin Barker, Jul 13 2018
EXAMPLE
Some solutions for n=4:
..0..1..1....0..0..0....0..1..0....0..0..0....0..0..0....0..0..1....0..1..0
..1..0..0....0..0..1....0..1..0....1..1..0....1..1..1....0..1..0....1..0..0
..0..0..1....1..0..1....0..0..1....2..1..0....0..0..0....0..1..0....0..1..0
..1..1..1....1..0..0....1..0..0....1..1..0....2..0..0....0..1..1....0..0..0
..2..1..2....1..0..0....0..0..1....2..1..0....2..2..2....0..0..0....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 14 2012
STATUS
approved