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 A199528 #7 Jul 22 2025 13:20:02 %S A199528 1,12,126,1432,16682,197962,2378412,28844590,352355640,4329146404, %T A199528 53439881140,662256127274,8234161234932,102668802658902, %U A199528 1283270183281782,16074009129375488,201718956009659774,2535677513896048744 %N A199528 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements. %C A199528 Column 6 of A199530 %H A199528 R. H. Hardin, <a href="/A199528/b199528.txt">Table of n, a(n) for n = 1..200</a> %e A199528 Some solutions for n=5 %e A199528 .-3...-3....3...-1...-2...-5...-4....4...-5....0...-3....2...-2....4....4....5 %e A199528 ..1....1....4...-1....3...-1....3...-1...-2...-2....2....3....3....1...-1...-3 %e A199528 ..1....5...-3....2...-5....0...-2...-2....0....4...-6...-5...-3....0....4....1 %e A199528 .-5....2....0....1....1....5....6...-3....6...-3....4...-3....1...-4...-5....0 %e A199528 ..6...-5...-4...-1....3....1...-3....2....1....1....3....3....1...-1...-2...-3 %K A199528 nonn %O A199528 1,2 %A A199528 _R. H. Hardin_ Nov 07 2011