OFFSET
1,2
COMMENTS
Column 7 of A221463
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..134
FORMULA
Empirical: a(n) = 7*a(n-1) +7*a(n-2)
EXAMPLE
Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..6....5....5....7....7....1....7....4....1....3....1....4....2....5....6....1
..1....4....5....3....2....2....4....7....1....5....2....3....5....2....7....2
..1....1....0....4....0....3....6....5....2....1....4....3....1....7....3....5
..4....6....4....4....3....7....1....2....1....1....2....0....0....4....5....1
..2....2....6....7....0....1....2....0....5....2....1....4....6....0....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 17 2013
STATUS
approved