OFFSET
1,2
COMMENTS
Column 4 of A230652
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +8*a(n-2) -a(n-3) -a(n-4) for n>5.
Empirical: G.f. 3*x^2*(1+x)*(x^2-5*x+3) / ( 1-3*x-8*x^2+x^3+x^4 ). - R. J. Mathar, Oct 27 2013
EXAMPLE
Some solutions for n=5
..0..x..0..x....0..x..0..x....2..x..0..x....1..x..1..x....0..x..0..x
..x..2..x..0....x..2..x..1....x..0..x..2....x..1..x..1....x..2..x..2
..0..x..2..x....0..x..1..x....2..x..2..x....2..x..1..x....2..x..1..x
..x..2..x..0....x..2..x..0....x..0..x..0....x..0..x..2....x..0..x..1
..0..x..0..x....0..x..2..x....2..x..2..x....2..x..0..x....2..x..2..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2013
STATUS
approved