%I #5 Mar 31 2012 12:36:37
%S 4,12,36,104,302,868,2490,7132,20424,58418,167036,477412,1364340,
%T 3898236,11138194,31824012,90926724,259790792,742259560,2120727868,
%U 6059178186,17311798890,49461883130,141318491362,403763748824
%N Number of -2..2 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero
%C Column 2 of A199943
%e Some solutions for n=6
%e .-2....2....2...-2....1...-2....1...-2...-1....1...-1...-1...-2...-1....2....2
%e ..2...-1...-1....1....2....2...-2....1....1....2....1...-2....2...-2...-1....1
%e .-1....2...-2...-1....1....1...-1...-2....2...-1...-2....2....1....1....2....2
%e .-2...-1....1....2....2...-1....1....2....1....2...-1...-1....2....2...-2....1
%e ..2....2....2...-2....1...-2...-2...-1....2...-1....2....1...-1...-2...-1....2
%e .-2....1...-1...-1...-1....1...-1....1...-1...-2....1...-2....1...-1....1...-1
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 12 2011