OFFSET
1,1
COMMENTS
Column 1 of A252695
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +9*a(n-2) -15*a(n-3) -30*a(n-4) +21*a(n-5) +80*a(n-6) +18*a(n-7) -132*a(n-8) -76*a(n-9) +88*a(n-10) +108*a(n-11) -32*a(n-12) -40*a(n-13) for n>14
EXAMPLE
Some solutions for n=4
..0..1..0....0..1..0....0..1..0....0..1..1....0..1..1....0..1..0....0..0..1
..2..1..2....2..3..2....2..1..2....2..3..2....2..3..2....2..1..2....2..0..0
..2..3..2....2..1..2....2..0..2....2..3..2....2..1..2....2..3..2....2..2..0
..0..1..0....0..3..0....1..0..1....0..2..0....0..3..0....1..3..1....3..2..2
..0..1..0....0..3..0....1..2..1....2..3..2....0..3..0....1..0..1....3..3..2
..2..2..3....1..2..2....3..0..3....2..3..2....2..1..2....3..3..2....1..3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2014
STATUS
approved