OFFSET
1,1
COMMENTS
Column 1 of A207283.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 2*a(n-2) + a(n-3) + 3*a(n-4) + a(n-5).
Empirical g.f.: 2*x*(1 + x)*(2 + x^2 + x^3) / (1 - 3*x - 2*x^2 - x^3 - 3*x^4 - x^5). - Colin Barker, Feb 20 2018
EXAMPLE
Some solutions for n=4:
..0....1....1....0....0....2....1....2....0....1....1....2....0....2....1....3
..1....3....0....2....3....0....3....2....2....3....3....3....0....0....1....0
..1....2....0....1....1....1....0....1....2....2....0....3....1....1....0....3
..3....2....0....3....2....2....0....0....1....1....1....0....1....1....3....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2012
STATUS
approved