OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 136*a(n-4) + 832*a(n-6) + 1600*a(n-8) + 1024*a(n-10).
Empirical g.f.: x*(81 + 308*x + 1144*x^2 + 4272*x^3 + 5264*x^4 + 19264*x^5 + 8704*x^6 + 31872*x^7 + 4096*x^8 + 18432*x^9) / (1 - 136*x^4 - 832*x^6 - 1600*x^8 - 1024*x^10). - Colin Barker, Oct 22 2018
EXAMPLE
Some solutions for n=5:
..1..0....1..0....1..1....2..2....2..1....2..0....1..1....0..0....2..1....2..1
..0..0....1..0....1..0....1..1....2..0....1..1....1..0....1..2....0..0....2..0
..2..1....0..2....2..2....1..0....2..0....1..0....1..0....1..1....0..1....2..2
..0..2....1..1....2..1....0..0....1..2....0..0....0..2....0..1....1..1....1..1
..1..0....0..1....1..1....2..1....0..0....1..2....2..1....1..0....0..2....1..1
..0..0....0..0....0..1....1..2....1..0....1..1....2..2....0..2....0..0....1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2014
STATUS
approved