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 1's, every 3 is next to 3 4's, every 4 is next to 4 2's
Column 3 of A196300
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 4*a(n-1) +3*a(n-2) -2*a(n-3) -3*a(n-4) -28*a(n-5) -108*a(n-6) -553*a(n-7) -1487*a(n-8) -406*a(n-9) +1679*a(n-10) +7367*a(n-11) +29776*a(n-12) +40461*a(n-13) +40921*a(n-14) +25939*a(n-15) +4942*a(n-16) -5887*a(n-17) -21877*a(n-18) -27360*a(n-19) -19016*a(n-20) +284*a(n-21) +3863*a(n-22) -2168*a(n-23) -3302*a(n-24) +3474*a(n-25) +1158*a(n-26) -171*a(n-27) -1312*a(n-28) +650*a(n-29) -96*a(n-30) +70*a(n-31) -18*a(n-32)
EXAMPLE
Some solutions for n=4
..0..2..1....0..1..1....1..1..0....0..0..1....0..0..1....0..0..0....0..1..1
..2..1..0....1..1..0....0..2..1....0..0..2....2..1..2....2..1..1....1..2..0
..1..1..1....2..1..1....0..2..1....0..2..1....1..1..2....1..1..1....1..0..0
..0..0..1....0..0..1....1..1..0....1..1..0....0..0..1....0..0..0....2..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 30 2011
STATUS
approved