OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..55
FORMULA
Empirical: a(n) = 7*a(n-1) +5*a(n-2) -135*a(n-3) +146*a(n-4) +1064*a(n-5) -1994*a(n-6) -4450*a(n-7) +11503*a(n-8) +10456*a(n-9) -38079*a(n-10) -12441*a(n-11) +78724*a(n-12) +1556*a(n-13) -103670*a(n-14) +15762*a(n-15) +85188*a(n-16) -20943*a(n-17) -40966*a(n-18) +11896*a(n-19) +10080*a(n-20) -3060*a(n-21) -936*a(n-22) +288*a(n-23)
EXAMPLE
Some solutions for n=5
..0...-2....0....0...-1....1....1....2....0....0....2...-1....1....1....1....2
..0...-1....0....1....0....0....0....0....0....0....0....0...-2....0....0....0
..0...-2...-2....0...-1...-2...-1...-2....0....2....1....1....1....2....2...-2
..0...-1....0...-2....0...-1....0...-1....2....0....0....2...-2....1....1....0
..1....2....0....0....0....0....0...-2....0...-1...-1...-1...-1....0....2...-2
..2....0....2...-1....1....1....1....0....2...-2....0...-2....0....2....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 16 2012
STATUS
approved