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 A224390 #6 Jul 23 2025 05:08:54 %S A224390 120,14400,881519,32806574,882833522,19879000458,424124440444, %T A224390 9276284077351,212972822153405,5078434646430668,123731812099601647, %U A224390 3047111408129189213,75453561534676485695,1874665689163421824860 %N A224390 Number of nX7 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing. %C A224390 Column 7 of A224391 %H A224390 R. H. Hardin, <a href="/A224390/b224390.txt">Table of n, a(n) for n = 1..210</a> %e A224390 Some solutions for n=3 %e A224390 ..0..0..0..0..0..0..0....0..0..1..1..2..3..3....0..0..0..0..0..0..2 %e A224390 ..0..0..0..1..2..3..3....0..2..2..2..2..2..2....0..0..2..2..2..2..3 %e A224390 ..0..0..0..1..1..2..2....0..1..1..2..2..3..3....0..0..0..0..2..2..2 %K A224390 nonn %O A224390 1,1 %A A224390 _R. H. Hardin_ Apr 05 2013