OFFSET
1,1
COMMENTS
Column 4 of A203656
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 69*a(n-1) +2528*a(n-2) -75120*a(n-3) +59456*a(n-4) +1531904*a(n-5) -345088*a(n-6) -1646592*a(n-7)
EXAMPLE
Some solutions for n=4
..0..2..2..0..0....4..1..0..1..1....0..3..2..3..4....1..2..4..4..4
..4..0..2..2..0....0..4..1..3..1....4..0..3..3..3....4..1..2..4..2
..3..4..0..2..2....0..0..4..1..3....2..4..0..3..1....1..3..1..2..0
..0..3..4..0..2....2..0..0..4..1....3..2..4..0..3....3..3..3..1..2
..3..0..3..4..0....3..2..0..0..4....4..3..2..4..0....2..3..1..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2012
STATUS
approved