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%I #4 Nov 18 2014 05:40:49
%S 5,25,41,161,487,1689,5849,19981,67459,221953,709677,2225181,6874957,
%T 21019457,63845081,193077349,582247055,1752693185,5269930487,
%U 15833493125,47548549519,142743601321,428431672069,1285708580949,3857979555851
%N Number of length n+2 0..2 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero
%C Column 2 of A250320
%H R. H. Hardin, <a href="/A250314/b250314.txt">Table of n, a(n) for n = 1..29</a>
%e Some solutions for n=6
%e ..2....1....1....2....0....1....0....2....1....1....1....0....0....0....1....1
%e ..2....0....0....2....1....0....2....1....1....0....1....1....0....2....0....1
%e ..1....0....0....0....1....0....2....1....1....0....2....0....1....1....0....1
%e ..0....0....0....1....2....1....1....2....1....1....2....2....1....1....0....1
%e ..1....0....2....1....1....0....0....1....1....2....1....0....2....2....0....2
%e ..2....1....0....2....1....2....1....1....1....2....0....0....2....1....0....0
%e ..2....1....1....0....1....2....1....1....0....2....1....0....0....2....1....0
%e ..0....0....0....2....0....1....1....2....0....1....1....1....0....2....2....2
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 18 2014
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