OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..51
FORMULA
Empirical: a(n) = 8*a(n-1) -13*a(n-2) -54*a(n-3) +187*a(n-4) +44*a(n-5) -781*a(n-6) +486*a(n-7) +1514*a(n-8) -1663*a(n-9) -1455*a(n-10) +2317*a(n-11) +629*a(n-12) -1634*a(n-13) -68*a(n-14) +606*a(n-15) -22*a(n-16) -112*a(n-17) +4*a(n-18) +8*a(n-19)
EXAMPLE
Some solutions for n=5
..0....1...-1....3....0....0...-2....2...-2....0...-2....2....0...-1....0...-2
..0....0...-3...-3....1...-3....0....0....2...-1...-2....2....1...-3....1...-1
..3....0....3...-1...-1....0....1....0...-2....0....2....2....0....3....0...-2
.-3....1....1...-3....0...-3....0....0...-2...-1....2....2...-1...-3...-2...-1
..0...-1...-1....3....1....0....0...-1....2...-2...-2...-2....0...-1....0...-2
.-3....1...-3...-3....0....3....0....0...-2...-3....2....2...-1...-3....1...-3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 20 2012
STATUS
approved