OFFSET
1,1
COMMENTS
Column 3 of A252423.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 38*a(n-3) -510*a(n-6) +3209*a(n-9) -10762*a(n-12) +20397*a(n-15) -22122*a(n-18) +13410*a(n-21) -4305*a(n-24) +686*a(n-27) -40*a(n-30) for n>37.
EXAMPLE
Some solutions for n=4
..3..0..1..0..3....3..0..1..3..0....0..0..1..0..0....0..1..0..0..3
..1..1..2..1..1....1..1..2..1..1....0..0..1..0..0....2..0..2..2..0
..0..0..1..0..0....0..0..1..0..3....1..1..2..1..1....2..0..2..2..0
..0..0..1..3..0....0..3..1..0..0....0..0..1..3..0....0..3..0..0..3
..1..1..2..1..1....1..1..2..1..1....0..0..1..0..2....1..0..2..2..0
..3..0..1..0..0....3..0..1..0..3....1..1..2..1..1....2..0..2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved