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 A230672 #7 Sep 04 2022 20:52:57 %S A230672 15,3387,340563,37034355,4022141121,436827078531,47444197636239, %T A230672 5152946201086569,559664961809994753,60785594007085980027, %U A230672 6601964808003397959249,717043900743978231419349 %N A230672 Number of n X 5 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j). %C A230672 Column 5 of A230675. %H A230672 R. H. Hardin, <a href="/A230672/b230672.txt">Table of n, a(n) for n = 1..210</a> %H A230672 R. H. Hardin, <a href="/A230672/a230672.txt">Empirical recurrence of order 80</a> %F A230672 Empirical recurrence of order 80 (see link above). %e A230672 Some solutions for n=3 %e A230672 ..0..0..2..1..1....0..0..0..1..1....0..0..1..1..1....0..0..2..1..2 %e A230672 ..2..2..1..1..0....1..2..2..0..2....2..2..1..0..2....1..2..0..0..1 %e A230672 ..2..0..0..2..1....0..1..0..2..0....0..2..0..1..1....0..1..1..1..2 %Y A230672 Cf. A230675. %K A230672 nonn %O A230672 1,1 %A A230672 _R. H. Hardin_, Oct 27 2013