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 A224178 #9 Mar 19 2025 14:04:45 %S A224178 120,14400,794220,24197608,468021427,6360047093,65713691148, %T A224178 549557637814,3906417081652,24494943831322,139244456386154, %U A224178 731876847737254,3607100658268390,16837953991281924 %N A224178 Number of 7 X n 0..3 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing. %e A224178 Some solutions for n=3 %e A224178 ..1..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A224178 ..2..0..0....0..0..1....0..2..0....0..0..0....2..2..0....0..0..0....0..0..0 %e A224178 ..2..0..0....0..0..1....1..2..0....0..0..0....2..2..0....0..0..0....0..0..0 %e A224178 ..2..1..0....0..2..2....1..2..1....1..0..0....2..3..0....0..0..1....0..2..1 %e A224178 ..2..2..1....0..3..2....1..3..2....1..1..1....2..3..0....0..2..1....1..3..1 %e A224178 ..2..2..3....0..3..2....3..3..3....1..1..2....2..3..0....0..2..1....3..3..1 %e A224178 ..3..3..3....2..3..3....3..3..3....1..3..3....2..3..2....1..3..3....3..3..2 %Y A224178 Row 7 of A224173. %K A224178 nonn %O A224178 1,1 %A A224178 _R. H. Hardin_, Mar 31 2013 %E A224178 Name corrected by _Andrew Howroyd_, Mar 18 2025