OFFSET
1,1
COMMENTS
Column 3 of A202532.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +2*a(n-3) -2*a(n-4) -2*a(n-5) +a(n-7) for n>8.
Empirical g.f.: x*(417 + 250*x + 95*x^2 - 691*x^3 - 432*x^4 + 114*x^5 + 218*x^6 + 20*x^7) / ((1 - x)*(1 + x^2 - x^3)*(1 - x - 2*x^2 - x^3)). - Colin Barker, Jun 01 2018
EXAMPLE
Some solutions for n=3.
..0..0..1..1..0....1..1..1..1..0....1..1..1..1..0....0..0..1..0..0
..0..1..1..1..1....1..1..1..1..1....1..1..1..1..0....0..1..1..1..0
..1..1..1..1..1....1..1..1..1..0....1..1..1..1..1....1..1..1..1..1
..1..1..1..0..0....1..1..1..1..0....1..1..1..1..1....0..1..1..1..0
..0..0..1..0..0....1..1..0..0..1....0..1..1..0..0....0..0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2011
STATUS
approved