OFFSET
1,1
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2's
Column 3 of A197235
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) +38*a(n-3) +40*a(n-4) +10*a(n-5) -150*a(n-6) -375*a(n-7) -175*a(n-8) +637*a(n-9) +2013*a(n-10) +1368*a(n-11) -1614*a(n-12) -4361*a(n-13) -4043*a(n-14) +946*a(n-15) +4156*a(n-16) +3551*a(n-17) +552*a(n-18) -881*a(n-19) -629*a(n-20) -1033*a(n-21) +508*a(n-22)
EXAMPLE
Some solutions for n=4
..1..3..1....1..0..0....0..1..0....2..0..0....0..0..2....0..0..0....0..0..0
..0..1..0....3..1..2....1..3..0....0..0..0....2..0..0....1..3..1....0..0..0
..0..0..0....1..2..0....0..1..0....1..3..1....2..0..0....0..1..0....0..0..0
..2..0..2....0..0..0....2..0..2....0..1..0....0..0..0....0..0..2....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 12 2011
STATUS
approved