OFFSET
1,1
COMMENTS
Column 2 of A183622.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 12*a(n-1)-24*a(n-2).
Conjecture: G.f.: 1/(x*(3- G(0))) -1/x, where G(k)= 1 + 2^k/(1 - 2*x/(2*x + 2^k*1/G(k+1) )); (continued fraction). - Sergei N. Gladkovskii, Jul 21 2013
EXAMPLE
Some solutions with the first square being 0123 for 5 X 3
..0..1..0....0..1..2....0..1..2....0..1..4....0..1..4....0..1..4....0..1..4
..2..3..2....2..3..0....2..3..0....2..3..2....2..3..2....2..3..2....2..3..2
..0..4..0....0..4..2....0..1..2....4..1..4....0..1..0....1..0..1....4..1..4
..1..3..1....1..3..0....4..3..4....0..3..0....4..3..4....3..4..3....2..0..3
..2..0..4....0..2..1....0..1..2....4..1..2....0..1..2....1..0..2....1..4..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved