OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) +6*a(n-2) -97*a(n-3) +62*a(n-4) +668*a(n-5) -852*a(n-6) -2556*a(n-7) +4359*a(n-8) +5935*a(n-9) -12593*a(n-10) -8545*a(n-11) +22727*a(n-12) +7400*a(n-13) -26431*a(n-14) -3396*a(n-15) +19783*a(n-16) +389*a(n-17) -9298*a(n-18) +302*a(n-19) +2606*a(n-20) -118*a(n-21) -392*a(n-22) +12*a(n-23) +24*a(n-24).
EXAMPLE
Some solutions for n=5
..1....0...-2....0....0....1....0....0....1...-2....1....0....0....3....3....0
.-1...-2...-1....2....2....3...-1...-1...-1...-2...-1....0....1....1....0...-1
..3....1....0....0...-2....1...-2....0...-1...-2....0....1....2...-1....0....1
.-1...-2....1...-2....0...-1...-1....0....1...-2....1...-1....1....1...-3....0
..0....0....0....2...-2...-3...-2....0...-1...-2....0....1....2...-1....0....1
.-1...-2...-1...-2....0...-1...-3....0...-1....2....0....0....3...-1....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 13 2012
STATUS
approved