OFFSET
1,1
COMMENTS
Column 5 of A229694
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 45*a(n-1) -729*a(n-2) +4995*a(n-3) -13122*a(n-4) +14580*a(n-5) -5832*a(n-6) for n>7.
Empirical: 12*x -x^2*(-1171+16870*x-90471*x^2+210096*x^3-212220*x^4+81648*x^5) / (18*x^2-15*x+1)^3. - R. J. Mathar, Sep 29 2013
EXAMPLE
Some solutions for n=3
..0..1..0..1..0....0..1..2..1..0....0..1..0..1..2....0..1..2..0..1
..0..1..0..1..2....2..1..0..1..2....2..1..2..0..2....0..2..1..0..2
..0..0..2..1..2....2..1..1..0..2....0..2..1..1..0....1..2..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 27 2013
STATUS
approved