OFFSET
1,1
COMMENTS
Column 4 of A223297
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 68*a(n-1) -156*a(n-2) -1911*a(n-3) +3816*a(n-4) +3960*a(n-5) -4572*a(n-6) for n>7
EXAMPLE
Some solutions for n=3
..0..1..0..3....0..3..0..8....1..0..5..0....1..0..3..4....0..1..0..3
..1..0..3..0....1..0..7..0....0..6..0..4....0..1..0..3....1..0..8..0
..0..1..0..6....0..7..0..2....2..0..7..0....2..0..8..0....0..4..0..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2013
STATUS
approved