OFFSET
1,1
COMMENTS
Column 2 of A233497
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 69*a(n-1) +18*a(n-2) -1125*a(n-3) +108*a(n-4) +4131*a(n-5) -3402*a(n-6) +729*a(n-7)
EXAMPLE
Some solutions for n=1
..0..0..0..2....0..0..0..2....0..2..1..2....0..0..1..0....0..2..0..1
..0..2..1..2....0..2..0..2....1..0..2..2....2..1..2..0....1..2..2..2
..2..0..2..0....2..2..2..1....0..0..0..1....2..2..0..2....2..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 11 2013
STATUS
approved