OFFSET
1,2
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 1's
Column 4 of A196809
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +9*a(n-2) +82*a(n-3) +137*a(n-4) +25*a(n-5) -6*a(n-6) +79*a(n-7) -153*a(n-8) -112*a(n-9) +76*a(n-10) -160*a(n-11) +136*a(n-12) -24*a(n-13)
EXAMPLE
Some solutions for n=5
..0..0..3..0....0..0..3..0....0..0..0..0....0..3..0..0....0..0..0..0
..0..3..0..3....0..0..0..0....0..1..0..0....0..0..3..0....3..0..0..0
..0..2..0..0....0..0..0..3....1..2..3..0....0..3..2..0....0..3..3..0
..0..3..0..0....3..0..0..0....0..3..0..3....0..0..0..3....3..0..0..3
..0..0..0..0....0..3..0..0....0..0..0..0....0..0..0..0....0..0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 06 2011
STATUS
approved