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 2's, every 3 is next to 3 0's, every 4 is next to 4 2's
Column 3 of A197648
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) +22*a(n-3) +162*a(n-4) +207*a(n-5) +40*a(n-6) -199*a(n-7) -964*a(n-8) -1725*a(n-9) -4618*a(n-10) +565*a(n-11) +1265*a(n-12) +854*a(n-13) -504*a(n-14) +24*a(n-15)
EXAMPLE
Some solutions for n=4
..0..0..1....0..1..1....2..2..1....0..0..0....0..0..0....0..0..1....1..2..2
..0..2..2....1..2..2....2..2..0....1..2..2....0..1..0....0..2..2....1..2..2
..0..2..2....0..2..2....1..1..0....1..2..2....0..2..2....0..2..2....0..0..0
..0..0..1....0..0..0....0..0..0....0..0..0....0..2..2....0..1..0....0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 16 2011
STATUS
approved