OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 8*a(n-2).
Conjectures from Colin Barker, Feb 02 2019: (Start)
G.f.: x*(2 - 3*x) / (1 - 7*x + 8*x^2).
a(n) = (2^(-4-n) * ((7-sqrt(17))^n * (-11+3*sqrt(17)) + (7+sqrt(17))^n*(11+3*sqrt(17)))) / sqrt(17).
(End)
EXAMPLE
Some solutions for n=4:
..0..1..1..0. .0..1..1..1. .0..1..0..1. .0..0..0..0. .0..1..2..1
..2..0..0..1. .1..0..2..2. .2..0..1..0. .1..2..1..1. .1..0..1..0
..0..2..2..2. .2..2..0..0. .0..1..0..2. .2..1..2..2. .2..1..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 20 2016
STATUS
approved