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 A263696 #14 Apr 08 2020 19:37:43 %S A263696 1,1,2,6,24,120,288,456,768,1508,3434,7560,16024,31872,61704,122464, %T A263696 246296,500506,1015010,2041372,4098824,8224718,16535378,33298104, %U A263696 67036986,134932118,271438490,545959366,1098340012,2209778140 %N A263696 Number of length n arrays of permutations of 0..n-1 with each element moved by -n to n places and every three consecutive elements having its maximum within 4 of its minimum. %e A263696 Some solutions for n=7 %e A263696 ..3....4....4....6....0....0....4....0....4....0....0....6....1....2....1....1 %e A263696 ..0....6....0....5....3....1....3....2....0....1....4....5....0....6....0....3 %e A263696 ..2....2....1....4....1....2....6....1....3....3....1....4....3....5....3....0 %e A263696 ..1....5....2....2....4....4....5....4....1....2....3....2....4....4....4....2 %e A263696 ..4....1....5....0....2....6....2....5....5....5....5....0....5....3....6....4 %e A263696 ..5....3....6....3....5....3....1....3....2....6....2....1....2....1....2....6 %e A263696 ..6....0....3....1....6....5....0....6....6....4....6....3....6....0....5....5 %Y A263696 Diagonal of A263703. %Y A263696 Cf. A333833. %K A263696 nonn %O A263696 0,3 %A A263696 _R. H. Hardin_, Oct 24 2015 %E A263696 a(0), a(23)-a(29) from _Alois P. Heinz_, Apr 08 2020