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 A200198 Number of -2..2 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences 1

%I #5 Mar 31 2012 12:36:38

%S 68,246,1042,3940,16092,63326,256314,1028100,4169932,16889228,

%T 68746558,279997576,1143494160,4675439056,19150647962,78534289030,

%U 322481118006,1325578996662,5454538071104,22464846352590,92602356718092

%N Number of -2..2 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences

%C Column 2 of A200204

%H R. H. Hardin, <a href="/A200198/b200198.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=3

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 14 2011

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