OFFSET
1,1
COMMENTS
Column 3 of A209019.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 30*a(n-1) +507*a(n-2) -3690*a(n-3) -16906*a(n-4) +106528*a(n-5) +124733*a(n-6) -1050424*a(n-7) +577820*a(n-8) +3131188*a(n-9) -4615763*a(n-10) -850984*a(n-11) +5888706*a(n-12) -4406256*a(n-13) +1242404*a(n-14) -133476*a(n-15) +1080*a(n-16) +864*a(n-17).
EXAMPLE
Some solutions for n=4
..3..1..2....3..2..3....0..1..3....3..1..2....0..2..0....1..0..2....1..2..0
..1..3..3....0..2..3....2..3..1....1..3..3....3..0..0....3..2..1....3..3..3
..3..1..3....3..0..1....1..3..0....3..0..1....2..1..1....1..0..3....0..0..0
..1..3..3....2..3..2....2..0..0....1..1..1....0..2..1....3..0..2....2..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2012
STATUS
approved