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 A188205 #8 Jul 22 2025 11:02:29 %S A188205 1,4,13,55,252,1242,6375,33885,184717,1028172,5820904,33427622, %T A188205 194299052,1141190188,6763576681,40405993509,243090678343, %U A188205 1471673620504,8959718123381,54824825183377,337018924981048,2080401423880834 %N A188205 Number of nondecreasing arrangements of n numbers in -(n+1)..(n+1) with sum zero. %C A188205 Column 3 of A188211 %H A188205 R. H. Hardin, <a href="/A188205/b188205.txt">Table of n, a(n) for n = 1..30</a> %e A188205 Some solutions for n=4 %e A188205 .-3...-4...-2...-5...-5...-5...-2...-5...-3...-4...-5...-4...-5...-3...-5...-5 %e A188205 .-2...-4...-2...-3....0....0...-2...-5...-2....0....1....1....0....1...-1...-2 %e A188205 ..2....4....2....3....2....0....1....5....1....0....1....1....1....1....1....3 %e A188205 ..3....4....2....5....3....5....3....5....4....4....3....2....4....1....5....4 %K A188205 nonn %O A188205 1,2 %A A188205 _R. H. Hardin_ Mar 24 2011