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 A223873 #6 Jul 23 2025 04:37:08 %S A223873 296,87616,12520369,1271992512,122550633425,12351748855245, %T A223873 1299083474922390,138955309650574888,14892661035553869840, %U A223873 1593443532741228709813,170300353977982013960252 %N A223873 Number of nX5 0..3 arrays with rows, diagonals and antidiagonals unimodal. %C A223873 Column 5 of A223876 %H A223873 R. H. Hardin, <a href="/A223873/b223873.txt">Table of n, a(n) for n = 1..210</a> %e A223873 Some solutions for n=3 %e A223873 ..0..0..3..2..1....0..0..1..1..2....0..0..1..0..0....0..0..0..3..0 %e A223873 ..0..0..0..3..1....0..0..0..2..2....0..0..2..3..0....0..0..0..0..0 %e A223873 ..0..0..1..0..0....0..0..0..1..0....0..1..2..3..0....0..0..0..2..1 %K A223873 nonn %O A223873 1,1 %A A223873 _R. H. Hardin_ Mar 28 2013