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 A229933 #6 Jun 02 2025 08:40:15 %S A229933 63,187211,174306687,183213209145,189537122520529,195955071996200947, %T A229933 202902063153139301263,210073683026638667977949, %U A229933 217469679800421836913361917,225130067038542417663060555935 %N A229933 Number of nX7 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j). %C A229933 Column 7 of A229934 %H A229933 R. H. Hardin, <a href="/A229933/b229933.txt">Table of n, a(n) for n = 1..37</a> %e A229933 Some solutions for n=3 %e A229933 ..0..0..0..0..2..1..1....0..0..0..0..2..1..1....0..0..0..0..0..2..0 %e A229933 ..2..0..2..2..2..0..0....2..0..2..0..1..2..2....2..0..2..1..1..2..0 %e A229933 ..0..0..1..1..1..0..2....0..0..0..2..0..0..2....0..0..2..0..0..2..2 %K A229933 nonn %O A229933 1,1 %A A229933 _R. H. Hardin_, Oct 04 2013