OFFSET
1,1
COMMENTS
Column 3 of A224204
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 20*a(n-1) -70*a(n-2) +228*a(n-3) -276*a(n-4) +392*a(n-5) -196*a(n-6) +144*a(n-7)
EXAMPLE
Some solutions for n=3
..0..0..1....0..0..2....1..2..3....1..0..0....0..2..2....0..0..2....3..0..0
..0..1..3....2..3..0....2..3..0....3..3..2....3..2..2....3..2..2....2..0..0
..1..3..1....3..0..0....3..2..2....3..3..0....3..2..1....2..3..2....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 01 2013
STATUS
approved