OFFSET
1,1
COMMENTS
Column 4 of A208872
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 198*a(n-1) -4637*a(n-2) +40574*a(n-3) -164314*a(n-4) +321776*a(n-5) -281785*a(n-6) +85300*a(n-7) -8100*a(n-8) for n>9
EXAMPLE
Some solutions for n=4
..0..0..1..0....0..1..1..2....0..1..0..0....0..0..1..2....0..0..0..1
..1..2..2..0....0..2..0..0....2..2..1..2....1..3..3..0....1..1..2..0
..2..3..3..0....0..1..3..0....1..2..3..2....1..0..1..2....0..1..1..3
..1..2..3..2....1..2..2..0....0..3..0..0....1..2..0..0....3..0..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 02 2012
STATUS
approved