OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-1) - 44*a(n-2) - 88*a(n-3) + 352*a(n-4) + 320*a(n-5) - 256*a(n-6).
Empirical g.f.: 3*x*(1 - 5*x - x^2 + 26*x^3 + 16*x^4 - 16*x^5) / ((1 + 2*x)*(1 - 4*x)*(1 - 8*x + 4*x^2)*(1 - 4*x - 8*x^2)). - Colin Barker, Jan 11 2019
EXAMPLE
Some solutions for n=4:
..0..2..0..1....0..0..2..2....0..2..1..2....0..1..1..2....0..2..1..0
..2..0..1..1....2..1..0..1....0..2..1..0....0..0..0..0....2..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved