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 A199703 #10 Jul 22 2025 13:22:57 %S A199703 1,14,156,1940,24394,314532,4099204,53901956,713719390,9503449352, %T A199703 127119684220,1706849222504,22991898594206,310564824249656, %U A199703 4205016717658718,57054704774633892,775562100878527252 %N A199703 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal. %C A199703 Column 7 of A199704 %H A199703 R. H. Hardin, <a href="/A199703/b199703.txt">Table of n, a(n) for n = 1..200</a> %e A199703 Some solutions for n=5 %e A199703 .-4....2....0....6....3....2...-1...-1....2....2...-4...-1....3....4....2...-4 %e A199703 ..1...-7...-1...-4....2...-5....3...-6....0....3...-1....6...-4...-3....0....7 %e A199703 ..4....2....6...-5...-2...-6...-5....4...-1...-5....6...-2...-6...-5...-3...-2 %e A199703 .-1...-1...-1...-1...-3....3....6....1....0....6...-7...-4....1...-1....4....6 %e A199703 ..0....4...-4....4....0....6...-3....2...-1...-6....6....1....6....5...-3...-7 %K A199703 nonn %O A199703 1,2 %A A199703 _R. H. Hardin_ Nov 09 2011