OFFSET
1,1
COMMENTS
Column 2 of A252523
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 17*a(n-3) -90*a(n-6) +188*a(n-9) -184*a(n-12) +89*a(n-15) -21*a(n-18) +2*a(n-21) for n>24
EXAMPLE
Some solutions for n=4
..3..2..3..3....2..2..1..2....3..3..2..3....3..2..0..3....2..2..1..2
..2..1..2..2....0..3..2..0....0..3..2..3....0..2..3..0....2..2..1..2
..3..2..3..0....3..3..2..3....2..2..1..2....2..1..2..2....1..1..3..1
..0..2..3..3....2..2..1..2....3..3..2..3....3..2..3..3....2..2..1..2
..2..1..2..2....0..3..2..0....3..0..2..3....3..2..0..3....2..2..1..0
..3..2..3..0....3..3..2..3....2..2..1..2....2..1..2..2....1..1..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2014
STATUS
approved