%I
%S 10,40,114,426,1650,6126,23206,88636,337866,1295566,4992364,19269156,
%T 74529210,288954786,1122363984,4366362420,17011617426,66365823648,
%U 259213619826,1013542247970,3966939195402,15540399135516,60929935280508
%N Number of 2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
%C Column 2 of A199832
%H R. H. Hardin, <a href="/A199826/b199826.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for n=3
%e ..0....0...1....0...1....1...1...1....1....1...1...2....0...2....1....1
%e ..1...1...2...2....2....2....0...2....0....2...2....1....2...2....1...2
%e .2...1....0....0....0....1...1....1....1....0....1....0...1....1....0...1
%e ..1....2....2....2....1...2....2....1...2...1....2....2...1....2...2....2
%e ..0....0....1....0...2...2....0....1....0...2....0...1....0....1....0....0
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 11 2011
