OFFSET
1,1
COMMENTS
Column 4 of A252157
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -2*a(n-2) +6*a(n-3) -18*a(n-4) +12*a(n-5) -8*a(n-6) +24*a(n-7) -16*a(n-8) for n>13
EXAMPLE
Some solutions for n=4
..3..3..2..3..3..3....3..2..3..3..3..2....2..0..2..2..1..2....3..3..2..3..3..3
..3..2..0..2..0..2....2..0..2..0..2..0....3..2..3..3..2..3....0..2..0..2..0..2
..3..0..2..0..2..3....3..2..0..2..0..2....3..2..3..3..2..3....2..0..2..0..2..0
..3..2..0..2..0..3....3..0..2..0..2..3....2..1..2..2..1..2....0..2..0..2..0..2
..2..0..2..0..2..3....3..2..0..2..0..3....3..2..3..3..2..3....3..0..2..0..2..0
..0..2..0..2..0..3....2..0..2..3..3..3....3..2..3..3..2..3....1..3..0..2..0..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2014
STATUS
approved