OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 20*a(n-1) - 10*a(n-2) - 324*a(n-3) - 277*a(n-4) + 144*a(n-5).
Empirical g.f.: x*(673 - 867*x - 13417*x^2 - 11213*x^3 + 5904*x^4) / (1 - 20*x + 10*x^2 + 324*x^3 + 277*x^4 - 144*x^5). - Colin Barker, Oct 12 2018
EXAMPLE
Some solutions for n=2:
..2..2..2..1....1..1..1..0....1..2..2..1....1..1..1..2....2..1..1..2
..2..1..1..1....0..0..0..0....1..1..1..2....0..1..2..1....2..2..1..1
..1..1..2..2....0..0..1..1....1..2..2..2....1..1..2..2....1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2013
STATUS
approved