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 A223724 #6 Jul 23 2025 04:25:58 %S A223724 239,57121,5087912,218619076,5733691150,105179942478,1461411174370, %T A223724 16206659678557,148957213473086,1167498177877341,7978569040814189, %U A223724 48389995885548620,264233150465396312,1314507634444102055 %N A223724 Number of nX7 0..2 arrays with rows, antidiagonals and columns unimodal. %C A223724 Column 7 of A223725 %H A223724 R. H. Hardin, <a href="/A223724/b223724.txt">Table of n, a(n) for n = 1..28</a> %e A223724 Some solutions for n=3 %e A223724 ..0..0..0..0..0..0..0....0..0..0..1..2..2..2....0..0..0..2..2..1..0 %e A223724 ..0..0..0..0..1..1..1....0..0..0..0..2..2..1....0..0..0..1..2..2..1 %e A223724 ..0..0..1..2..0..0..0....0..0..0..0..0..2..0....0..0..1..1..1..2..2 %K A223724 nonn %O A223724 1,1 %A A223724 _R. H. Hardin_ Mar 26 2013