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 A230188 #6 Jun 02 2025 08:42:50 %S A230188 0,513,16815,1603431,133265847,11393567289,967087903539, %T A230188 82226647665621,6988859258823513,594060143921819223, %U A230188 50495027179295395167,4292081456142986073615,364827090034511080822419 %N A230188 Number of 5Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value 2-x(i,j). %C A230188 Row 5 of A230184 %H A230188 R. H. Hardin, <a href="/A230188/b230188.txt">Table of n, a(n) for n = 1..210</a> %e A230188 Some solutions for n=3 %e A230188 ..2..0..2....0..2..1....1..1..2....0..2..2....1..1..0....0..2..0....2..0..2 %e A230188 ..1..1..1....1..1..0....2..0..2....0..0..2....0..2..1....1..1..2....2..0..2 %e A230188 ..0..2..1....0..2..1....1..1..0....2..1..0....0..1..1....2..0..1....2..1..1 %e A230188 ..1..1..1....0..1..1....0..2..1....1..2..2....0..2..2....1..1..1....1..0..2 %e A230188 ..0..2..0....1..0..2....1..1..1....2..0..2....0..0..2....0..2..0....2..1..1 %K A230188 nonn %O A230188 1,2 %A A230188 _R. H. Hardin_, Oct 11 2013