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%I #7 Oct 19 2021 21:41:57
%S 1,5,27,171,1077,6963,45523,300417,1995897,13332697,89461271,
%T 602525231,4070925653,27580062519,187294750351,1274550544383,
%U 8689294370837,59336253329567,405779196651853,2778627840692687,19049684072515863
%N Number of zero-sum -4..4 arrays of n elements with adjacent element differences also in -4..4.
%C Column 4 of A202252.
%H R. H. Hardin, <a href="/A202248/b202248.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=7
%e ..3....0....0...-4....2...-3....0...-1....2....2...-3...-3....4....2...-1....2
%e ..3....0....2....0...-2...-4...-1....3...-2....3....0....1....1....2...-2....1
%e ..2....2....0...-3....1....0....3....1...-2....0....0....2....0...-1....1....1
%e ..1...-1...-1....1...-3....0....0....3...-1...-1....4...-2...-2....2....1...-3
%e .-3...-3...-1....3....0....4...-3...-1...-1....0....1....1...-1....0...-1...-3
%e .-3....0....0....3....1....1....0...-1....1...-3....1....1...-2...-1....2....0
%e .-3....2....0....0....1....2....1...-4....3...-1...-3....0....0...-4....0....2
%Y Cf. A202252.
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 14 2011
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