OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..58
FORMULA
Empirical: a(n) = 4*a(n-1) +11*a(n-2) -61*a(n-3) -20*a(n-4) +343*a(n-5) -156*a(n-6) -890*a(n-7) +756*a(n-8) +1066*a(n-9) -1196*a(n-10) -504*a(n-11) +720*a(n-12) +72*a(n-13) -144*a(n-14)
EXAMPLE
Some solutions for n=5
.-1...-1...-1....2...-2...-1....1....2...-1....1...-1...-1....1...-2...-1....1
..0...-2...-2...-1...-1...-2....0....1...-2...-2....0...-2....2....0....2....2
.-1...-1....0...-2...-2....1...-1....0....0...-1...-1....1...-1...-1...-1....1
..0....0....2...-1....1....0....0....2...-2...-2....0....2....2....0....2....0
..1...-2....0...-2...-2...-1....1....0...-1...-1...-1...-1....1...-1....0...-1
..0....0....2...-1....0....2....2....1...-2....0....0....2....0...-2....2...-2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 16 2012
STATUS
approved