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 A224125 #6 Jul 23 2025 05:00:21 %S A224125 20,1080,47059,1703178,53355889,1491827492,38051383139,899713542225, %T A224125 19963535397227,419672473818646,8421847090410941,162325525523034609, %U A224125 3020162740527368685,54468878788851494328,955569173872191005683 %N A224125 Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal. %C A224125 Row 3 of A224123 %H A224125 R. H. Hardin, <a href="/A224125/b224125.txt">Table of n, a(n) for n = 1..21</a> %e A224125 Some solutions for n=3 %e A224125 ..0..2..3....2..1..0....2..2..1....0..2..1....1..0..1....0..2..3....0..1..2 %e A224125 ..1..2..2....2..3..0....0..3..2....2..1..3....2..2..2....0..3..2....2..3..0 %e A224125 ..2..2..3....1..3..1....1..2..2....2..1..3....1..2..3....3..0..2....0..3..3 %K A224125 nonn %O A224125 1,1 %A A224125 _R. H. Hardin_ Mar 31 2013