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 A223875 #6 Jul 23 2025 04:37:23 %S A223875 1163,1352569,539511985,112751480926,18196418303111,2864914204785815, %T A223875 484392484470533427,87639412130515076262,16416724973038782090075, %U A223875 3109914769847317351993452,590107761875963492888166548 %N A223875 Number of nX7 0..3 arrays with rows, diagonals and antidiagonals unimodal. %C A223875 Column 7 of A223876 %H A223875 R. H. Hardin, <a href="/A223875/b223875.txt">Table of n, a(n) for n = 1..19</a> %e A223875 Some solutions for n=3 %e A223875 ..0..0..0..0..0..3..0....0..0..0..0..3..3..0....0..0..0..0..1..0..0 %e A223875 ..0..0..0..0..1..2..1....0..0..0..0..2..3..0....0..0..0..0..1..1..1 %e A223875 ..0..0..0..0..1..2..1....0..0..0..0..1..1..1....0..0..0..0..3..1..1 %K A223875 nonn %O A223875 1,1 %A A223875 _R. H. Hardin_ Mar 28 2013