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 A199529 #7 Jul 22 2025 13:20:09 %S A199529 1,14,168,2212,29750,407946,5662636,79345982,1119873360,15897133212, %T A199529 226731289148,3246399497138,46636478912912,671855095655758, %U A199529 9702557118121642,140418234266554336,2035998107250999870 %N A199529 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements. %C A199529 Column 7 of A199530 %H A199529 R. H. Hardin, <a href="/A199529/b199529.txt">Table of n, a(n) for n = 1..200</a> %e A199529 Some solutions for n=5 %e A199529 ..3...-6...-3....5...-1....1....0....4...-7...-6...-6...-6....4...-3...-3...-4 %e A199529 .-3....7....0...-5....2...-2...-1...-4....2....5....5...-3....1...-2...-2....4 %e A199529 .-3....3....7....2....5...-7....4...-3....7....6...-2....6...-4...-2....7....3 %e A199529 .-3...-5...-1...-5...-7....7....0...-1...-2...-3....0....4....2....5....5...-3 %e A199529 ..6....1...-3....3....1....1...-3....4....0...-2....3...-1...-3....2...-7....0 %K A199529 nonn %O A199529 1,2 %A A199529 _R. H. Hardin_ Nov 07 2011