OFFSET
1,1
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 1's, every 2 is next to 2 2's, every 3 is next to 3 4's, every 4 is next to 4 0's
Column 3 of A197079
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) +18*a(n-3) +17*a(n-4) -8*a(n-5) -38*a(n-6) -85*a(n-7) -42*a(n-8) +81*a(n-9) +65*a(n-10) +14*a(n-11) -24*a(n-12) -29*a(n-13) +19*a(n-14) +18*a(n-15) -a(n-16) -3*a(n-17) -8*a(n-18) +2*a(n-19)
EXAMPLE
Some solutions for n=4
..0..0..1....0..0..0....0..0..0....1..0..0....0..0..0....1..2..2....0..0..0
..0..0..1....1..1..0....0..4..0....1..0..0....1..1..0....1..2..2....2..2..0
..0..2..2....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....2..2..0
..0..2..2....1..1..0....1..1..0....0..0..0....0..1..1....0..1..1....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 09 2011
STATUS
approved