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 A223667 #6 Jul 23 2025 04:22:10 %S A223667 22,484,5913,49561,364959,2715255,21347949,176196273,1493319998, %T A223667 12752674920,108775648521,925164714995,7854870418554,66655562324108, %U A223667 565717490459602,4802772296256892,40782742978895315,346338434126201765 %N A223667 Number of nX6 0..1 arrays with rows, diagonals and antidiagonals unimodal. %C A223667 Column 6 of A223669 %H A223667 R. H. Hardin, <a href="/A223667/b223667.txt">Table of n, a(n) for n = 1..210</a> %e A223667 Some solutions for n=4 %e A223667 ..0..1..1..0..0..0....0..1..1..0..0..0....0..0..0..0..0..0....0..1..1..1..0..0 %e A223667 ..0..0..1..1..1..1....0..1..1..1..1..1....0..0..0..0..0..0....1..1..1..1..0..0 %e A223667 ..0..1..1..1..1..1....1..1..1..0..0..0....0..1..1..1..1..0....0..1..1..1..1..0 %e A223667 ..0..0..0..1..1..1....0..0..0..0..0..0....0..1..1..1..0..0....0..1..0..0..0..0 %K A223667 nonn %O A223667 1,1 %A A223667 _R. H. Hardin_ Mar 25 2013