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 A224396 #6 Jul 23 2025 05:09:28 %S A224396 16384,10000000,279128617,2780848289,17642791909,90682660877, %T A224396 424124440444,1895527656502,8186764103582,33998418651060, %U A224396 134714450368164,506671733476920,1805110329656189,6093246282673576,19519515186829602 %N A224396 Number of 7Xn 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing. %C A224396 Row 7 of A224391 %H A224396 R. H. Hardin, <a href="/A224396/b224396.txt">Table of n, a(n) for n = 1..23</a> %e A224396 Some solutions for n=3 %e A224396 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A224396 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A224396 ..0..0..0....0..0..1....0..0..2....0..0..2....0..0..2....0..0..0....0..0..2 %e A224396 ..0..2..2....2..2..2....2..2..3....0..2..3....0..0..3....0..0..0....2..2..2 %e A224396 ..0..1..1....0..2..2....0..2..2....0..0..0....0..3..3....0..1..1....0..3..3 %e A224396 ..1..2..2....2..3..3....2..3..3....0..2..2....0..2..2....1..2..3....2..2..2 %e A224396 ..0..1..2....0..2..3....0..3..3....0..0..3....0..1..3....1..2..3....0..1..1 %K A224396 nonn %O A224396 1,1 %A A224396 _R. H. Hardin_ Apr 05 2013