OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) - 2*a(n-3) + a(n-4) for n>27.
EXAMPLE
Some solutions for n=3:
..1..2....1..0....1..3....1..4....0..4....0..3....0..1....1..3....0..0....2..0
..1..4....1..2....1..5....1..5....1..3....1..1....0..3....2..1....0..2....2..1
..3..4....3..2....3..5....2..5....2..4....3..2....2..3....3..3....2..2....3..1
..3..2....3..0....3..3....2..4....1..5....2..4....2..1....2..5....2..0....3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved