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 A250274 #5 Jul 23 2025 12:16:13 %S A250274 6,48,140,1132,6732,51884,381812,2783500,19762916,135821156,901633552, %T A250274 5803821376,36474619144,225357234996,1376605005684,8348102460156 %N A250274 Number of length n+1 0..5 arrays with the sum of the squares of adjacent differences multiplied by some arrangement of +-1 equal to zero. %C A250274 Column 5 of A250277 %e A250274 Some solutions for n=6 %e A250274 ..4....4....2....0....0....5....1....3....4....1....3....0....2....3....0....0 %e A250274 ..2....4....1....1....3....5....2....2....1....1....2....3....3....5....2....3 %e A250274 ..4....0....2....5....5....2....5....3....5....5....2....2....5....5....3....0 %e A250274 ..3....4....1....3....1....5....1....3....4....5....4....3....2....2....4....1 %e A250274 ..1....1....5....1....2....4....2....2....4....4....5....3....5....0....3....5 %e A250274 ..2....4....2....1....1....4....4....1....1....0....5....3....1....4....5....4 %e A250274 ..0....4....0....4....0....3....1....3....0....1....3....0....2....3....2....4 %K A250274 nonn %O A250274 1,1 %A A250274 _R. H. Hardin_, Nov 16 2014