OFFSET
1,1
COMMENTS
Column 6 of A258730
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +80*a(n-6) -204*a(n-7) +177*a(n-8) -52*a(n-9) -125*a(n-12) +184*a(n-13) -68*a(n-14) +10*a(n-18) -4*a(n-19)
EXAMPLE
Some solutions for n=4
..0....3....0....3....3....1....0....2....0....0....1....0....0....3....3....1
..3....3....0....3....3....2....1....0....3....2....1....2....2....3....1....2
..0....0....2....0....1....3....0....1....3....0....0....2....0....1....1....0
..0....2....3....0....1....3....0....2....3....0....0....2....0....1....2....1
..0....2....0....0....2....1....1....3....3....1....0....2....1....1....3....2
..0....2....0....1....2....1....2....3....3....1....3....1....2....1....3....2
..1....3....0....2....2....1....2....3....3....1....3....1....2....1....3....3
..3....3....2....2....3....1....3....3....0....1....3....1....3....1....0....3
..2....3....3....0....1....2....2....1....1....2....0....1....3....3....1....0
..2....3....3....1....3....3....3....3....2....2....1....1....0....1....1....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 08 2015
STATUS
approved