OFFSET
1,1
COMMENTS
Row 2 of A205626.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) +2*a(n-2) -28*a(n-3) +32*a(n-5).
Empirical g.f.: 6*x*(12 - 21*x - 78*x^2 + 56*x^3 + 128*x^4) / ((1 - 2*x)*(1 - 2*x^2)*(1 - 4*x - 8*x^2)). - Colin Barker, Jun 12 2018
EXAMPLE
Some solutions for n=4:
..0..0..0..0..0....0..1..2..2..1....0..1..2..1..2....0..1..0..0..0
..0..1..0..1..0....0..0..1..2..2....0..1..2..1..2....2..1..2..2..1
..1..0..1..0..1....1..2..1..0..0....0..0..1..0..1....0..2..2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2012
STATUS
approved