OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-2) + 16*a(n-4) - 16*a(n-6) for n>8.
Empirical g.f.: 8*x*(3026 + 384*x - 2701*x^2 + 84*x^3 - 47804*x^4 - 5578*x^5 + 44239*x^6 + 1600*x^7) / ((1 - x)*(1 + x)*(1 - 2*x)*(1 + 2*x)*(1 + 4*x^2)). - Colin Barker, Dec 14 2018
EXAMPLE
Some solutions for n=4:
..1..1..1..1..1....0..2..0..0..1....1..0..1..2..2....1..0..1..0..2
..0..1..1..2..0....0..0..1..0..2....0..1..1..2..0....1..2..1..2..2
..1..0..2..1..1....0..1..0..1..0....1..0..2..1..1....2..1..2..1..2
..0..1..1..2..0....2..1..2..1..2....0..1..1..2..0....0..1..0..1..1
..1..0..2..1..2....1..2..1..2..1....2..0..2..0..0....1..0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2015
STATUS
approved