OFFSET
1,1
COMMENTS
Column 5 of A205736.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 46*a(n-2) -632*a(n-4) +2550*a(n-6) +21009*a(n-8) -338191*a(n-10) +2275083*a(n-12) -9977849*a(n-14) +32125123*a(n-16) -80295305*a(n-18) +160702817*a(n-20) -261977927*a(n-22) +350645053*a(n-24) -385924893*a(n-26) +348163021*a(n-28) -255626391*a(n-30) +151046918*a(n-32) -70664605*a(n-34) +25553415*a(n-36) -6884895*a(n-38) +1300906*a(n-40) -153820*a(n-42) +8568*a(n-44) for n>51.
EXAMPLE
Some solutions for n=4:
..2..0..1..1..1..0....0..2..2..2..0..0....1..0..2..2..1..1....0..0..0..1..2..2
..2..0..1..2..1..2....1..2..1..2..0..1....2..0..2..0..0..1....0..1..0..1..2..0
..0..1..2..1..0..2....1..0..2..0..1..2....2..1..0..2..1..0....1..0..1..2..0..2
..0..1..2..1..0..1....2..0..2..0..1..2....0..0..0..0..0..0....1..0..1..2..0..2
..1..0..1..0..2..1....1..1..0..1..2..0....0..0..0..0..0..0....2..1..0..1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 30 2012
STATUS
approved