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A200425 Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero 1

%I

%S 92,520,2232,9898,50592,270848,1432402,7469120,38883992,203526914,

%T 1071337158,5658347658,29934599276,158560687098,841075030030,

%U 4468272429398,23771639720040,126620792508358,675163140324368

%N Number of -3..3 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero

%C Column 3 of A200430

%H R. H. Hardin, <a href="/A200425/b200425.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=3

%e ..1....1....1...-3....0....0....2....3...-1....0....0...-1....1....1...-3...-2

%e .-2...-3....3....2....2....3...-3...-1....2...-1...-3...-3....2....1....0....1

%e .-2...-3....3....0...-3....3....0....0....3....2....1....0....1....0...-3....3

%e .-2....2...-2....2...-2...-2...-1...-3...-1...-3....3....2....0...-3....1....2

%e ..3....0...-3....2....1...-2....0...-1....0....0....0....0...-2...-2....3...-1

%e ..2....3...-2...-3....2...-2....2....2...-3....2...-1....2...-2....3....2...-3

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 17 2011

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Last modified June 19 15:03 EDT 2021. Contains 345141 sequences. (Running on oeis4.)