OFFSET
1,1
COMMENTS
Column 5 of A224038.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) - 10*a(n-2) + a(n-3) + 6*a(n-4) + a(n-5) - 4*a(n-6) + 4*a(n-7) - 4*a(n-8) + 8*a(n-9) for n>10.
Empirical g.f.: x*(6 - 10*x - 11*x^2 - 4*x^3 + 10*x^4 + 18*x^5 + 3*x^6 - 14*x^7 - 4*x^9) / ((1 - 2*x)*(1 - 4*x + 2*x^2 + 3*x^3 - x^5 + 2*x^6 + 4*x^8)). - Colin Barker, Aug 26 2018
EXAMPLE
Some solutions for n=3:
..0..0..0..0..0....0..0..0..1..1....0..0..0..0..0....0..0..0..1..1
..0..1..1..1..1....0..1..1..1..1....0..1..1..1..1....0..1..1..1..1
..1..1..1..1..1....0..1..1..1..1....0..0..1..1..1....1..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2013
STATUS
approved