OFFSET
1,1
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 2's, every 2 is next to 2 0's, every 3 is next to 3 4's, every 4 is next to 4 1's
Column 3 of A196802
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) +39*a(n-3) +95*a(n-4) +300*a(n-5) -178*a(n-6) +28*a(n-7) -400*a(n-8) -156*a(n-9) -1924*a(n-10) -2663*a(n-11) +756*a(n-12) -155*a(n-13) -1379*a(n-14) +1596*a(n-15) +963*a(n-16) -3105*a(n-17) -1112*a(n-18) +2019*a(n-19) +974*a(n-20) -123*a(n-21) -136*a(n-22) -60*a(n-23) -7*a(n-24) +5*a(n-25) +a(n-26)
EXAMPLE
Some solutions for n=4
..0..0..0....0..0..2....0..0..0....0..0..2....1..2..0....1..2..0....0..0..0
..0..1..0....2..1..0....0..2..1....0..0..0....0..0..2....0..0..0....0..0..0
..1..2..0....0..0..0....0..2..1....0..0..0....0..0..2....2..2..0....0..2..2
..0..0..2....2..0..2....0..0..0....2..0..0....0..0..0....0..2..0....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 06 2011
STATUS
approved