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 A188174 #10 Jul 22 2025 11:00:56 %S A188174 1,2,8,43,252,1636,11322,81805,610358,4672836,36525052,290399543, %T A188174 2342043630,19118822650,157709971144,1312796873451,11015236989702, %U A188174 93078467831012,791462018168032,6767910089071288,58167781282121262 %N A188174 Number of strictly increasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero. %C A188174 Diagonal of A188181 %H A188174 R. H. Hardin, <a href="/A188174/b188174.txt">Table of n, a(n) for n = 1..32</a> %e A188174 Some solutions for n=5 %e A188174 .-8...-7...-4...-6...-6...-7...-8...-8...-5...-5...-7...-6...-5...-7...-4...-7 %e A188174 .-6...-4...-2...-5...-5...-2...-1...-3...-2...-2...-5...-4...-3...-3...-3...-4 %e A188174 .-1....1....0...-3....1....1....0...-1...-1...-1....0...-1...-1....2...-1....1 %e A188174 ..7....4....2....6....3....3....1....5....0....1....4....3....3....3....3....2 %e A188174 ..8....6....4....8....7....5....8....7....8....7....8....8....6....5....5....8 %K A188174 nonn %O A188174 1,2 %A A188174 _R. H. Hardin_ Mar 23 2011