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 A223812 #7 Jul 23 2025 04:33:20 %S A223812 22,337,4120,43941,426527,3875213,33540705,279734339,2266708593, %T A223812 17952142360,139568672552,1068728748298,8081450512876,60468894195838, %U A223812 448444819136394,3300666311519663,24136833802226245,175525144342241365 %N A223812 Number of nX3 0..2 arrays with row sums nondecreasing and column sums unimodal. %C A223812 Column 3 of A223815 %H A223812 R. H. Hardin, <a href="/A223812/b223812.txt">Table of n, a(n) for n = 1..64</a> %e A223812 Some solutions for n=3 %e A223812 ..1..1..2....2..0..1....1..2..0....1..0..0....1..0..0....0..2..0....1..2..0 %e A223812 ..2..2..0....0..1..2....1..1..1....1..1..2....0..2..0....1..2..0....2..2..0 %e A223812 ..0..2..2....1..2..1....1..2..2....0..2..2....1..1..0....2..2..2....1..1..2 %K A223812 nonn %O A223812 1,1 %A A223812 _R. H. Hardin_ Mar 27 2013