OFFSET
1,1
COMMENTS
Column 4 of A252423
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 25*a(n-3) -146*a(n-6) +295*a(n-9) -193*a(n-12) +20*a(n-15) for n>21
EXAMPLE
Some solutions for n=4
..2..0..1..0..0..1....1..1..2..1..1..2....2..1..1..2..1..1....0..1..0..3..1..0
..0..3..1..0..0..1....0..0..1..3..0..1....1..0..0..1..0..2....0..1..0..0..1..0
..1..1..2..1..1..2....3..0..1..0..0..1....1..0..0..1..3..0....1..2..1..1..2..1
..3..0..1..0..0..1....1..1..2..1..1..2....2..1..1..2..1..1....0..1..0..3..1..0
..0..0..1..3..0..1....0..0..1..3..0..1....1..0..0..1..0..3....0..1..0..0..1..3
..1..1..2..1..1..2....0..3..1..0..0..1....1..3..0..1..0..0....1..2..1..1..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved