OFFSET
1,1
COMMENTS
Column 3 of A221328.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..69
FORMULA
Empirical: a(n) = 23*a(n-1) - 110*a(n-2) + 111*a(n-3) - 6*a(n-4) - 8*a(n-5).
Empirical g.f.: x*(1 - x)*(7 - 35*x + 6*x^2 + 8*x^3) / (1 - 23*x + 110*x^2 - 111*x^3 + 6*x^4 + 8*x^5). - Colin Barker, Aug 05 2018
EXAMPLE
Some solutions for n=3:
..2..1..0....2..2..0....1..1..0....1..1..1....2..1..0....1..0..1....1..0..2
..2..0..1....0..2..0....2..0..2....0..2..1....1..0..1....1..2..0....2..1..0
..1..0..2....0..1..2....0..2..1....1..0..2....2..2..0....1..2..1....0..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 11 2013
STATUS
approved