OFFSET
1,1
COMMENTS
Column 2 of A203796.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 13*a(n-1) +6*a(n-2).
Empirical g.f.: 16*x*(49 + 24*x) / (1 - 13*x - 6*x^2). - Colin Barker, Jun 05 2018
EXAMPLE
Some solutions for n=4:
..0..2..3....0..1..0....1..3..2....1..0..0....3..2..2....3..1..3....2..1..1
..3..0..2....3..0..1....2..1..3....0..0..3....1..3..2....1..3..3....2..2..1
..2..3..0....1..3..0....2..2..1....1..0..0....1..1..3....3..1..3....0..2..2
..3..1..3....3..1..3....0..2..2....0..1..0....0..1..1....1..3..2....3..0..2
..1..3..3....0..3..0....2..2..1....1..3..1....0..0..1....3..0..3....2..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2012
STATUS
approved