OFFSET
1,1
COMMENTS
Column 1 of A252130
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 25*a(n-3) -221*a(n-6) +784*a(n-9) -755*a(n-12) -683*a(n-15) +977*a(n-18) -126*a(n-21) for n>26
EXAMPLE
Some solutions for n=4
..2..2..1....2..0..0....2..2..1....3..2..0....0..2..3....2..2..1....1..2..2
..3..3..2....2..3..0....3..0..2....0..2..0....3..2..3....3..3..2....2..3..0
..3..3..2....1..2..2....3..0..2....2..1..2....2..1..2....0..0..2....2..3..3
..2..2..1....2..3..3....2..2..1....3..2..3....3..2..3....2..2..1....1..2..2
..3..3..2....2..3..0....0..3..2....0..2..0....0..2..0....0..3..2....2..3..3
..0..0..2....1..2..2....0..3..2....2..1..2....2..1..2....0..3..2....2..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2014
STATUS
approved