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 A224049 #5 Jul 23 2025 04:57:34 %S A224049 1163,180821,7655477,153482649,1999959111,20096076442,169750613182, %T A224049 1265415997425,8609328529478,54810160645347,332129717908612, %U A224049 1933871450604161,10857958349352084,58782328259016090 %N A224049 Number of nX7 0..3 arrays with rows and columns unimodal and antidiagonals nondecreasing. %C A224049 Column 7 of A224050 %e A224049 Some solutions for n=3 %e A224049 ..0..0..0..0..0..2..0....0..0..0..0..0..1..1....0..0..0..0..0..0..0 %e A224049 ..0..0..0..2..2..1..0....0..0..0..3..3..3..2....0..0..0..0..0..2..1 %e A224049 ..0..0..3..2..2..0..0....0..0..3..3..3..3..3....0..0..2..2..2..2..3 %K A224049 nonn %O A224049 1,1 %A A224049 _R. H. Hardin_ Apr 01 2013