OFFSET
1,1
COMMENTS
Column 4 of A252640
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 145*a(n-3) -7116*a(n-6) +136668*a(n-9) -902360*a(n-12) +4683424*a(n-15) -17197984*a(n-18) +26472832*a(n-21) -12749824*a(n-24) +720896*a(n-27) for n>35
EXAMPLE
Some solutions for n=4
..2..2..3..2..2..0....1..3..3..1..3..3....1..2..1..1..2..1....1..2..1..1..2..1
..3..2..2..3..2..2....1..2..1..1..2..1....0..3..1..0..3..1....3..3..1..3..0..1
..3..1..3..3..1..3....3..0..1..3..0..1....1..3..3..1..3..0....1..0..3..1..0..3
..2..2..3..2..2..3....1..3..3..1..0..3....1..2..1..1..2..1....1..2..1..1..2..1
..0..2..2..3..2..2....1..2..1..1..2..1....0..3..1..0..3..1....3..0..1..3..0..1
..0..1..3..3..1..3....3..3..1..3..0..1....1..3..3..1..3..0....1..0..3..1..0..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2014
STATUS
approved