OFFSET
1,1
COMMENTS
Row 4 of A233256.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 160*a(n-1) -6144*a(n-2) +86016*a(n-3) -393216*a(n-4) for n>8.
EXAMPLE
Some solutions for n=3
..0..1..2....0..1..2....0..1..2....0..1..0....0..1..2....0..1..0....0..1..0
..2..1..0....0..4..3....0..4..0....0..2..4....2..4..3....2..1..3....5..2..1
..5..2..5....0..1..0....0..1..5....4..3..1....2..0..4....2..5..3....4..3..1
..0..2..1....2..1..5....0..3..1....4..5..4....3..0..4....2..1..5....4..2..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 06 2013
STATUS
approved