This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A199829 #7 Jul 22 2025 13:24:09 %S A199829 70,660,5390,49302,462234,4340094,41008804,389832124,3723199342, %T A199829 35697026718,343371074564,3312138136660,32026131818486, %U A199829 310327172410762,3012628449222084,29294846427926718,285286085845772334 %N A199829 Number of -5..5 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero. %C A199829 Column 5 of A199832 %H A199829 R. H. Hardin, <a href="/A199829/b199829.txt">Table of n, a(n) for n = 1..200</a> %e A199829 Some solutions for n=3 %e A199829 ..2....2....0....0...-5...-3....3...-4...-3...-2....2....1....5....2...-4....0 %e A199829 .-5....4...-4...-4....1...-3...-5....2....4...-5...-5....1...-3...-3....0....4 %e A199829 ..4...-1....3...-2....3...-4...-3....5....3...-2....4...-4....5...-5....5....4 %e A199829 .-2...-4....0....4...-1....5....0...-4....1....4....0....5...-4....3...-1...-3 %e A199829 ..1...-1....1....2....2....5....5....1...-5....5...-1...-3...-3....3....0...-5 %K A199829 nonn %O A199829 1,1 %A A199829 _R. H. Hardin_ Nov 11 2011