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 A224207 #8 Jul 23 2025 05:03:31 %S A224207 1024,160000,4357084,54177872,451319098,2981774784,17178450136, %T A224207 91585310015,466549088803,2294426837986,10864811370660,49206477503159, %U A224207 211954893113813,865842155983471,3352909875833504,12323194613924281 %N A224207 Number of 5Xn 0..3 arrays with rows unimodal and antidiagonals nondecreasing. %C A224207 Row 5 of A224204 %H A224207 R. H. Hardin, <a href="/A224207/b224207.txt">Table of n, a(n) for n = 1..210</a> %H A224207 R. H. Hardin, <a href="/A224207/a224207.txt">Empirical polynomial of degree 30</a> %F A224207 Empirical polynomial of degree 30 (see link above) %e A224207 Some solutions for n=3 %e A224207 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A224207 ..0..0..2....2..2..0....2..2..0....2..0..0....2..2..1....0..2..0....0..0..2 %e A224207 ..1..2..0....2..0..0....3..3..0....3..3..3....2..2..0....2..2..2....0..2..1 %e A224207 ..3..2..0....0..0..0....3..1..0....3..3..0....3..2..0....2..2..1....3..2..1 %e A224207 ..2..0..0....3..3..3....2..1..1....3..0..0....3..2..0....3..3..2....2..2..2 %K A224207 nonn %O A224207 1,1 %A A224207 _R. H. Hardin_ Apr 01 2013