OFFSET
1,2
COMMENTS
Every 0 is next to 0 0's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's
Column 3 of A197250
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-2) +9*a(n-3) +26*a(n-4) +58*a(n-5) -25*a(n-6) -148*a(n-7) -104*a(n-8) -114*a(n-9) +55*a(n-10) -149*a(n-11) +186*a(n-12) -9*a(n-13) +39*a(n-14) -55*a(n-15) +21*a(n-16) +a(n-17) +2*a(n-18) -a(n-19) for n>20
EXAMPLE
Some solutions for n=4
..1..0..1....1..0..1....1..0..1....1..0..1....1..0..1....1..1..0....1..0..1
..2..2..1....3..1..2....1..2..2....2..2..1....2..1..3....0..2..1....2..1..3
..1..1..0....1..1..0....0..1..1....1..1..0....0..1..1....1..3..1....0..1..1
..0..2..1....0..2..1....1..2..0....0..1..1....1..2..0....2..1..0....1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 12 2011
STATUS
approved