OFFSET
1,1
COMMENTS
Column 4 of A252334
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 80*a(n-3) -2144*a(n-6) +23724*a(n-9) -158776*a(n-12) +799868*a(n-15) -3070635*a(n-18) +8464040*a(n-21) -16514775*a(n-24) +19850956*a(n-27) +507284*a(n-30) -49936700*a(n-33) +87410468*a(n-36) -81815088*a(n-39) +52347751*a(n-42) -24360640*a(n-45) +8126204*a(n-48) -1987776*a(n-51) +346880*a(n-54) -31744*a(n-57) +1024*a(n-60) for n>64
EXAMPLE
Some solutions for n=4
..2..3..0..2..3..0....2..2..1..2..2..1....3..2..3..3..2..3....1..2..2..1..2..2
..1..2..2..1..2..0....3..0..2..3..0..2....3..2..3..3..2..0....2..3..3..2..3..3
..2..3..3..2..0..3....0..3..2..0..3..2....2..1..2..2..1..2....2..3..0..2..3..3
..2..0..3..2..3..3....2..2..1..2..2..1....3..2..3..3..2..3....1..2..2..1..2..2
..1..2..2..1..2..2....3..0..2..3..3..0....0..2..3..0..2..3....0..3..3..2..0..3
..2..3..3..2..3..3....1..3..2..0..3..2....2..1..2..2..1..2....2..3..3..2..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2014
STATUS
approved