OFFSET
1,1
COMMENTS
Column 2 of A222944.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-1) - 9*a(n-2) for n>4.
Conjectures from Colin Barker, Aug 16 2018: (Start)
G.f.: x*(2 - 13*x - 19*x^2 + 6*x^3) / ((1 - x)*(1 - 9*x)).
a(n) = 3 + 10*3^(2*n-5) for n>2
(End)
EXAMPLE
Some solutions for n=3:
..0..1....0..1....0..1....0..0....0..1....0..1....0..0....0..0....0..1....0..1
..2..3....2..3....2..3....1..1....2..2....2..3....1..1....1..2....2..3....0..1
..1..4....4..0....4..4....2..2....1..0....2..0....2..3....3..3....1..0....2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 09 2013
STATUS
approved