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 A224309 #6 Jul 23 2025 05:05:35 %S A224309 239,10511,174378,1825800,15312504,118317987,911404794,7236130163, %T A224309 59751261572,512310103541,4533427479414,41097427928564, %U A224309 379017425099579,3535755438091183,33225644610034806,313628721090498518 %N A224309 Number of nX7 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224309 Column 7 of A224310 %H A224309 R. H. Hardin, <a href="/A224309/b224309.txt">Table of n, a(n) for n = 1..210</a> %e A224309 Some solutions for n=3 %e A224309 ..0..0..0..0..1..2..2....0..0..0..1..2..1..0....0..0..2..2..0..0..0 %e A224309 ..0..0..2..2..2..2..0....0..0..1..2..1..0..0....0..2..2..2..2..0..0 %e A224309 ..2..2..2..2..2..0..0....0..2..2..1..1..1..0....2..2..2..2..1..0..0 %K A224309 nonn %O A224309 1,1 %A A224309 _R. H. Hardin_ Apr 03 2013