OFFSET
1,1
COMMENTS
Column 2 of A252407.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 16*a(n-3) -74*a(n-6) +141*a(n-9) -235*a(n-12) +206*a(n-15) -72*a(n-18) +16*a(n-21) +4*a(n-24) -a(n-27) for n>31.
EXAMPLE
Some solutions for n=4
..2..3..2..2....0..2..2..3....3..2..2..0....0..2..0..0....1..0..2..0
..3..0..1..3....3..1..3..0....2..3..2..2....3..3..0..3....0..3..3..1
..3..2..2..3....2..2..3..2....0..3..1..3....2..0..0..2....0..2..0..0
..2..3..2..2....0..2..2..3....3..2..2..3....0..2..0..0....0..0..2..0
..3..3..1..0....3..1..3..0....2..3..2..2....3..3..0..3....0..3..3..0
..3..2..2..3....2..2..3..2....3..0..1..3....2..0..1..2....0..2..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved