OFFSET
1,1
COMMENTS
Column 4 of A269097.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 90*a(n-1) -2559*a(n-2) +24556*a(n-3) -94959*a(n-4) +140442*a(n-5) -69169*a(n-6) for n>7
EXAMPLE
Some solutions for n=2
..1..1..1..2. .1..3..3..1. .0..1..0..0. .0..2..2..3. .1..0..1..0
..0..1..0..2. .0..0..1..3. .2..3..2..1. .1..2..3..1. .3..2..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 19 2016
STATUS
approved