The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #5 Mar 31 2012 12:36:37
%S 24,140,646,3556,20240,113884,645780,3685550,21117750,121503530,
%T 701432670,4060132070,23557575574,136975281374,797920002262,
%U 4655761528566,27205829211568,159187551327960,932560727269722
%N Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
%C Column 3 of A199832
%H R. H. Hardin, <a href="/A199827/b199827.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for n=3
%e .-1...-2....3...-3....0....0...-3....2....1....0....1....2...-1....1....3....0
%e .-1...-3...-2...-2....2....1....1....3...-2....1....2...-1....2....3....0....1
%e ..3....0....1....3...-1...-3....3....1....0...-2...-1....2....1....1...-1....0
%e .-2....3...-3....3....2....0...-1...-3...-1...-1...-3...-3....0...-3...-2....2
%e ..1....2....1...-1...-3....2....0...-3....2....2....1....0...-2...-2....0...-3
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 11 2011