OFFSET
1,1
COMMENTS
Column 2 of A232406
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-2) +4*a(n-3) -3*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) +6*a(n-8) +2*a(n-9).
Empirical: G.f.: -4*x*(1+4*x-6*x^3-7*x^4+3*x^5+5*x^6+3*x^7+x^8) / ( -1 +5*x^2 +4*x^3 -3*x^4 -12*x^5 -3*x^6 +6*x^7 +6*x^8 +2*x^9 ). - R. J. Mathar, Nov 27 2013
EXAMPLE
Some solutions for n=4
..2..1..0....0..1..0....1..2..1....2..1..0....2..1..0....0..1..0....0..1..0
..1..0..1....1..2..1....0..1..0....1..2..1....1..0..1....1..2..1....1..2..1
..0..1..2....0..1..0....2..0..2....0..1..2....0..1..2....0..1..2....0..1..0
..1..0..1....1..2..1....1..2..1....1..2..1....1..2..1....1..0..1....1..2..1
..2..1..0....0..1..2....0..1..0....0..1..0....0..1..0....2..1..2....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2013
STATUS
approved