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 A224124 #6 Jul 23 2025 05:00:14 %S A224124 10,150,1747,16782,140210,1050460,7227405,46371039,281020959, %T A224124 1623035066,9002891450,48234712165,250875276249,1271548675730, %U A224124 6302249244967,30627310088497,146302624587552,688283767932118,3194839035650041 %N A224124 Number of 2Xn 0..3 arrays with row sums nondecreasing and column sums unimodal. %C A224124 Row 2 of A224123 %H A224124 R. H. Hardin, <a href="/A224124/b224124.txt">Table of n, a(n) for n = 1..72</a> %e A224124 Some solutions for n=3 %e A224124 ..2..1..3....1..2..3....2..2..0....1..3..2....3..2..1....0..1..2....1..3..3 %e A224124 ..3..3..0....3..2..3....2..3..2....2..3..1....3..1..2....1..2..0....2..3..3 %K A224124 nonn %O A224124 1,1 %A A224124 _R. H. Hardin_ Mar 31 2013