OFFSET
1,1
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 2's, every 3 is next to 3 1's, every 4 is next to 4 4's
Column 3 of A196485
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 4*a(n-1) -5*a(n-2) +16*a(n-3) -22*a(n-4) +a(n-5) +13*a(n-6) -47*a(n-7) -4*a(n-8) -20*a(n-9) -46*a(n-10) +68*a(n-11) +112*a(n-12) -121*a(n-13) +243*a(n-14) -56*a(n-15) +275*a(n-16) +347*a(n-17) +286*a(n-18) +198*a(n-19) +28*a(n-20) +7*a(n-21) -9*a(n-22) -5*a(n-23) +2*a(n-24) for n>25
EXAMPLE
Some solutions for n=4
..0..0..1....0..1..1....0..1..1....0..0..0....2..2..2....0..0..0....0..2..2
..1..1..1....2..2..0....2..2..0....0..0..0....2..0..2....1..1..1....0..2..2
..2..2..0....2..2..0....2..2..0....0..2..2....2..2..2....3..1..1....0..0..0
..2..2..0....0..1..1....0..0..0....1..2..2....1..0..0....1..0..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 03 2011
STATUS
approved