OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-3) for n>8.
Empirical g.f.: 4*x*(617 + 295*x + 619*x^2 - 3814*x^3 + 580*x^4 - 509*x^5 - 672*x^6 - 2304*x^7) / ((1 - 2*x)*(1 + 2*x + 4*x^2)). - Colin Barker, Dec 01 2018
EXAMPLE
Some solutions for n=4:
..0..1..1..0..1..1..0..1..1....3..0..3..0..0..2..0..0..2
..2..0..0..2..0..0..3..0..0....2..1..0..1..1..0..1..1..0
..0..1..1..0..1..1..0..1..1....1..1..0..1..1..0..1..1..0
..0..1..1..0..1..1..0..1..1....0..0..2..0..0..2..0..0..2
..3..0..0..2..0..0..2..0..0....1..1..0..1..1..0..1..1..0
..0..1..1..0..1..1..0..2..1....2..1..0..1..1..0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2014
STATUS
approved