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 A224279 #6 Jul 23 2025 05:04:12 %S A224279 610,59792,2059793,44901359,817075668,14587480744,274116529912, %T A224279 5481124776302,115036474923900,2489043013161042,54774515108860284, %U A224279 1216015762754882736,27117272628943751854,606168132402047719588 %N A224279 Number of nX6 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224279 Column 6 of A224281 %H A224279 R. H. Hardin, <a href="/A224279/b224279.txt">Table of n, a(n) for n = 1..210</a> %e A224279 Some solutions for n=3 %e A224279 ..0..0..0..1..1..1....0..0..0..0..3..0....0..0..0..0..1..0....0..0..0..0..1..0 %e A224279 ..0..0..1..2..1..0....0..0..0..3..3..0....0..0..0..2..2..0....0..0..0..2..0..0 %e A224279 ..0..3..3..3..2..1....0..3..3..3..2..2....0..2..3..2..1..1....0..0..3..3..1..1 %K A224279 nonn %O A224279 1,1 %A A224279 _R. H. Hardin_ Apr 02 2013