OFFSET
1,1
COMMENTS
Column 1 of A252640
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 25*a(n-3) -222*a(n-6) +815*a(n-9) -1085*a(n-12) +696*a(n-15) -756*a(n-18) for n>24
EXAMPLE
Some solutions for n=4
..3..3..1....1..3..0....0..1..2....3..0..1....1..3..0....0..1..3....3..2..2
..3..2..2....0..2..1....1..3..0....0..2..2....2..3..2....0..1..2....3..1..3
..2..0..2....0..3..1....0..1..3....2..3..2....2..2..3....1..3..3....2..2..3
..3..3..1....1..3..0....1..1..2....3..0..1....1..3..3....0..1..3....3..2..2
..3..2..2....1..2..0....1..0..3....0..2..2....2..0..2....1..1..2....3..1..0
..2..3..2....3..3..1....0..1..3....2..3..2....2..2..3....1..0..3....2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2014
STATUS
approved