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