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 A188232 #11 Jun 05 2025 19:38:54 %S A188232 1,6,24,121,598,3047,15696,81981,432491,2302608,12355260,66761159, %T A188232 362992938,1984748322,10907074884,60215001180,333824553431, %U A188232 1857784353244,10375296176688,58131888133855,326686361277196,1841007865239913 %N A188232 Number of nondecreasing arrangements of n numbers in -(n+3)..(n+3) with sum zero and not more than two numbers equal. %H A188232 R. H. Hardin, <a href="/A188232/b188232.txt">Table of n, a(n) for n = 1..28</a>. %e A188232 Some solutions for n=4 %e A188232 .-4...-5...-5...-5...-7...-6...-7...-5...-4...-2...-6...-7...-3...-4...-1...-6 %e A188232 ..0...-2....0...-3...-2....0...-6....1...-2....0...-6...-4...-3...-1...-1....1 %e A188232 ..0....2....0....4....3....3....6....1....2....1....5....5....0....1....1....2 %e A188232 ..4....5....5....4....6....3....7....3....4....1....7....6....6....4....1....3 %Y A188232 Column 5 of A188236. %K A188232 nonn %O A188232 1,2 %A A188232 _R. H. Hardin_, Mar 24 2011