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 A202956 Number of arrays of n+2 integers in -2..2 with sum zero and adjacent elements differing in absolute value 1

%I

%S 6,28,82,200,524,1724,5908,18340,53680,162080,515626,1651124,5168256,

%T 15997588,50018962,158377344,502147864,1584312736,4991421852,

%U 15779264936,50053153920,158866891408,503893624892,1598691706648,5078888702164

%N Number of arrays of n+2 integers in -2..2 with sum zero and adjacent elements differing in absolute value

%C Column 2 of A202962

%H R. H. Hardin, <a href="/A202956/b202956.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..0....2....0...-1....2....2...-1....1...-1...-1...-2....0....2....0....0....2

%e .-1....0...-2....0....0....0....2...-2...-2....0....0...-1....0...-2....1....0

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

%e ..0...-1....0....0...-1...-1....2....0...-2....0....2....0....0....2...-1....2

%e .-2....0...-1....1...-2....0...-1...-1....1....1....0....2...-1...-1....0...-1

%e ..0...-1....2....0....0....1....0....2....2....2...-1....1....0....2....2...-2

%e ..1....2....0....1...-1....0...-1...-1....1....0....2....0...-2....0....0....0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 26 2011

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Last modified December 8 05:44 EST 2021. Contains 349590 sequences. (Running on oeis4.)