OFFSET
1,1
COMMENTS
Column 2 of A252640
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 70*a(n-3) -1858*a(n-6) +23748*a(n-9) -154484*a(n-12) +505834*a(n-15) -868331*a(n-18) +1055614*a(n-21) -1024560*a(n-24) +324000*a(n-27) for n>36
EXAMPLE
Some solutions for n=4
..1..3..3..1....2..0..2..2....3..3..1..3....3..1..3..0....1..3..2..2
..2..3..2..2....3..3..1..0....2..1..1..2....2..2..0..2....0..3..1..3
..2..2..0..2....3..2..2..3....3..1..3..3....3..2..2..3....0..2..2..0
..1..0..3..1....2..3..2..2....0..3..1..3....3..1..3..0....2..3..2..2
..2..0..2..2....3..3..1..3....2..1..1..2....2..2..3..2....3..0..1..3
..2..2..3..2....3..2..2..3....3..1..3..3....0..2..2..0....0..2..2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2014
STATUS
approved