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 A252176 #5 Jul 23 2025 13:37:25 %S A252176 8,1464,4680,79672,654644,6994984,59838132,513937352,4190189694, %T A252176 34020988396,273415166334,2193948803940 %N A252176 Number of length n+2 0..7 arrays with the sum of the maximum minus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero. %C A252176 Column 7 of A252177 %e A252176 Some solutions for n=4 %e A252176 ..0....6....4....2....1....7....3....0....6....7....3....2....1....0....3....2 %e A252176 ..0....0....0....6....5....0....1....0....4....3....6....0....4....1....7....5 %e A252176 ..5....0....7....2....1....4....6....0....6....4....4....3....2....3....4....1 %e A252176 ..6....1....5....6....4....1....1....5....5....3....7....2....3....0....6....6 %e A252176 ..4....3....7....5....1....6....6....7....6....3....1....5....6....6....1....6 %e A252176 ..3....2....7....2....4....0....5....5....3....1....7....4....3....6....0....0 %K A252176 nonn %O A252176 1,1 %A A252176 _R. H. Hardin_, Dec 15 2014