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A250314 Number of length n+2 0..2 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero 1

%I

%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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Last modified September 26 20:34 EDT 2021. Contains 347672 sequences. (Running on oeis4.)