OFFSET
1,1
COMMENTS
Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 4's, every 4 is next to 4 2's
Column 4 of A196329
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) +9*a(n-3) +12*a(n-4) +24*a(n-5) +6*a(n-6) +33*a(n-7) +4*a(n-8) -28*a(n-9) -6*a(n-10) -38*a(n-11) -17*a(n-12) +3*a(n-13) -17*a(n-14) +2*a(n-15) +2*a(n-16) -2*a(n-17) +2*a(n-18) +2*a(n-19) +2*a(n-20) +a(n-21) +2*a(n-22)
EXAMPLE
Some solutions for n=5
..0..0..2..0....0..0..0..0....0..0..0..0....0..0..0..2....2..0..0..0
..2..2..2..0....0..2..2..2....0..0..0..0....0..0..0..0....0..0..2..2
..0..0..0..0....0..2..0..0....2..2..2..2....0..2..2..2....2..2..2..0
..0..0..2..2....0..2..2..2....0..0..0..0....0..2..0..0....0..0..0..0
..2..0..2..0....2..0..0..0....2..0..0..2....0..2..0..0....0..2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 01 2011
STATUS
approved