OFFSET
1,1
COMMENTS
Column 1 of A223423
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-2) for n>3
EXAMPLE
Some solutions for n=3
..5....0....5....3....3....0....3....4....0....0....1....2....6....1....2....0
..2....2....2....1....1....1....1....1....2....1....3....0....2....4....5....1
..0....6....6....4....3....4....0....3....0....3....1....1....5....1....2....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved