OFFSET
1,1
COMMENTS
Column 4 of A270058.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 306*a(n-1) -27803*a(n-2) +685150*a(n-3) -6795613*a(n-4) +28270996*a(n-5) -41396356*a(n-6) for n>7
EXAMPLE
Some solutions for n=2
..2..4..2..1. .3..2..1..0. .1..3..4..1. .2..0..0..3. .1..2..3..0
..4..4..0..0. .4..3..2..2. .0..2..1..1. .0..3..2..2. .3..4..3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 09 2016
STATUS
approved