OFFSET
1,1
COMMENTS
Column 5 of A228683.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 12*a(n-1) -27*a(n-2) -32*a(n-3) +49*a(n-4) +20*a(n-5) -5*a(n-6).
Empirical g.f.: -x*(-13+59*x+4*x^2-64*x^3-15*x^4+5*x^5) / ( 1-12*x+27*x^2+32*x^3-49*x^4-20*x^5+5*x^6 ). - R. J. Mathar, Sep 02 2013
EXAMPLE
Some solutions for n=4:
..0..0..1..0..0....0..0..0..0..0....0..0..1..0..0....0..1..0..0..1
..0..0..0..0..1....0..0..1..0..1....0..0..0..0..1....0..0..0..0..1
..1..0..0..0..0....0..0..0..0..0....1..0..0..0..1....0..0..0..0..1
..0..0..1..0..0....0..0..0..0..1....0..0..0..0..0....1..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 30 2013
STATUS
approved