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 A250164 #6 Jul 23 2025 12:14:29 %S A250164 6,48,380,2860,19896,129648,810964,4962056,30034672,180893724, %T A250164 1087112084,6527090276,39173693352,235070531992,1410496377492, %U A250164 8463170413616,50779536937024,304678626418660,1828075665965204,10968465043204908 %N A250164 Number of length n+1 0..5 arrays with the sum of adjacent differences multiplied by some arrangement of +-1 equal to zero. %C A250164 Column 5 of A250167 %H A250164 R. H. Hardin, <a href="/A250164/b250164.txt">Table of n, a(n) for n = 1..27</a> %e A250164 Some solutions for n=6 %e A250164 ..3....0....3....4....4....1....0....3....3....4....3....1....4....3....1....3 %e A250164 ..2....2....2....0....5....1....0....4....5....0....3....4....0....0....4....5 %e A250164 ..1....5....1....0....4....2....4....0....1....0....3....3....2....2....3....0 %e A250164 ..1....0....0....4....4....4....1....5....4....3....3....0....4....0....5....4 %e A250164 ..2....4....1....3....2....0....5....5....5....5....4....3....4....1....1....2 %e A250164 ..5....3....3....0....0....1....3....2....3....2....5....3....5....0....2....3 %e A250164 ..1....4....1....4....2....3....2....3....5....2....3....1....0....1....1....1 %K A250164 nonn %O A250164 1,1 %A A250164 _R. H. Hardin_, Nov 13 2014