OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) + 14*a(n-2) + 16*a(n-3) - 2*a(n-4) + 4*a(n-5).
Empirical g.f.: 6*x^2*(1 - x)*(2 + x) / (1 - 5*x - 14*x^2 - 16*x^3 + 2*x^4 - 4*x^5). - Colin Barker, Sep 23 2018
EXAMPLE
Some solutions for n=3:
..0..1....0..0....0..2....0..1....0..0....0..0....0..1....0..1....0..2....0..1
..1..2....2..1....1..2....1..2....1..2....1..2....2..2....2..0....1..0....2..1
..0..1....0..1....0..1....0..2....0..0....0..1....1..0....0..1....0..2....0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved