A200032 - OEIS

%I #5 Mar 31 2012 12:36:37

%S 0,4,2,28,26,168,214,1140,1882,7930,15222,56732,122760,416928,975508,

%T 3116724,7715598,23651892,60875844,181428684,479853296,1403488666,

%U 3783362306,10927395294

%N Number of -2..2 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero

%C Column 2 of A200038

%e Some solutions for n=6

%e .-2...-2....2...-2....1...-1....1....1....2....2....1....2....2....1....1....1

%e ..2....2...-1....1...-1...-2...-1....2...-2...-2...-1...-1...-2...-1...-2...-2

%e .-1....1....1....2....2...-1....2...-2...-1...-1....1...-2...-1....2....2....2

%e ..2....2...-2...-1....1....1...-1...-1....2....1...-2....1...-2...-2...-1...-2

%e .-2...-1....1...-2...-2....2....1....1...-2...-2...-1....2....1....1....1...-1

%e ..1...-2...-1....2...-1....1...-2...-1....1....2....2...-2....2...-1...-1....2

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 12 2011