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 A222347 #5 Oct 30 2022 06:34:42 %S A222347 21,108,440,1690,6405,24276,92340,352674,1352032 %N A222347 Number of (n+3) X 1 arrays of occupancy after each element moves up to +-n places including 0. %C A222347 Row 3 of A222345. %e A222347 Some solutions for n=3 %e A222347 ..1....2....0....0....2....3....0....0....1....2....1....0....0....2....1....0 %e A222347 ..1....0....2....1....1....2....0....0....1....3....1....1....3....2....3....1 %e A222347 ..1....0....0....3....1....0....0....4....2....1....0....0....0....0....1....2 %e A222347 ..1....4....1....2....1....0....6....0....1....0....1....0....1....2....0....0 %e A222347 ..0....0....3....0....0....0....0....1....0....0....1....2....0....0....1....2 %e A222347 ..2....0....0....0....1....1....0....1....1....0....2....3....2....0....0....1 %Y A222347 Cf. A222345. %K A222347 nonn %O A222347 1,1 %A A222347 _R. H. Hardin_, Feb 16 2013