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A200428 Number of -6..6 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 940,10250,98052,955602,10217182,111101654,1206988576,13090995142,

%T 142480007436,1556876199472,17066756670292,187540784116604,

%U 2065041046363200,22780124416681858,251710751862388016

%N Number of -6..6 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero

%C Column 6 of A200430

%H R. H. Hardin, <a href="/A200428/b200428.txt">Table of n, a(n) for n = 1..64</a>

%e Some solutions for n=3

%e .-5...-4...-4....2...-5....6....4...-1...-4....1...-4....5....6....3....0...-6

%e ..3....1....3...-5...-2....2....6....0....2...-2...-4...-1...-5....2....3...-4

%e ..0....1...-4...-5....3....1...-3....6...-1...-2....1...-5....2....1....2....5

%e .-4...-3....2....3....2...-5...-2....5....6....5....6....2...-6...-5...-3....4

%e ..2...-1....5....1....5....1...-3...-4....1....1...-1...-3....2...-5....0....4

%e ..4....6...-2....4...-3...-5...-2...-6...-4...-3....2....2....1....4...-2...-3

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 17 2011

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Last modified July 25 12:15 EDT 2021. Contains 346290 sequences. (Running on oeis4.)