OFFSET
1,1
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's
Column 3 of A197180
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) +6*a(n-2) -2*a(n-3) -5*a(n-4) -20*a(n-5) -4*a(n-6) +24*a(n-7) -4*a(n-8) -16*a(n-9) -3*a(n-10) +47*a(n-11) -24*a(n-12) -5*a(n-13) +3*a(n-14)
EXAMPLE
All solutions containing all values 0 to 4 for n=4
..2..1..0....0..0..0....0..1..2....0..0..0
..1..0..3....0..4..0....3..0..1....0..4..0
..0..4..0....1..0..3....0..4..0....3..0..1
..0..0..0....2..1..0....0..0..0....0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 11 2011
STATUS
approved