OFFSET
1,1
COMMENTS
Row 3 of A214101
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +15*a(n-2) -33*a(n-3) -22*a(n-4) +38*a(n-5) +8*a(n-6) -8*a(n-7).
Empirical: G.f. -x*(2*x^2-1)*(8*x^3-8*x^2-23*x+9) / ( (x-1)*(2*x-1)*(1+x)*(2*x^2-5*x+1)*(2*x^2+4*x+1) ). - R. J. Mathar, Jul 04 2012
EXAMPLE
Some solutions for n=4
..0..1..0..2..1....0..1..0..1..2....0..1..2..0..1....0..1..2..0..1
..1..2..1..0..2....2..0..2..0..1....2..0..1..2..0....1..2..1..2..0
..0..1..0..2..1....0..1..0..1..2....0..1..2..1..2....2..0..2..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 04 2012
STATUS
approved