OFFSET
1,2
COMMENTS
Column 3 of A229637
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-1) -81*a(n-2) +185*a(n-3) -162*a(n-4) +60*a(n-5) -8*a(n-6) for n>7.
Empirical: g.f. x -4*x^2*(2*x-5)*(12*x^4-45*x^3+47*x^2-17*x+2) / (2*x^2-5*x+1)^3. - R. J. Mathar, Sep 29 2013
EXAMPLE
Some solutions for n=3
..0..1..1....0..1..0....0..0..1....0..1..2....0..0..1....0..1..0....0..1..1
..2..1..0....0..2..0....1..2..0....2..1..0....2..1..2....0..1..0....0..2..0
..0..1..0....2..1..2....0..2..1....0..1..1....0..1..2....1..2..2....0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 27 2013
STATUS
approved