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 A186550 #7 Jul 22 2025 10:24:19 %S A186550 168200,88662978,31976088817,13544245035035,5541254050323697, %T A186550 2292090739550640497,945658119457845662613,390484318597052432729179, %U A186550 161199926899075628268006706,66551276226155618695804703318 %N A186550 1/8192 the number of (n+2)X6 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace. %C A186550 Column 4 of A186553 %H A186550 R. H. Hardin, <a href="/A186550/b186550.txt">Table of n, a(n) for n = 1..20</a> %e A186550 Some solutions for 4X6 %e A186550 ..0..0..1..0..0..2....0..0..0..2..0..1....0..2..2..0..0..1....0..2..2..0..0..2 %e A186550 ..0..0..0..2..0..1....0..0..0..0..0..3....0..0..0..0..1..3....0..0..0..2..0..3 %e A186550 ..0..0..0..0..0..3....0..0..0..2..2..1....0..0..0..0..0..1....0..0..0..2..0..3 %e A186550 ..0..0..0..0..3..1....0..0..0..0..0..1....0..0..0..0..0..2....0..0..0..0..1..1 %K A186550 nonn %O A186550 1,1 %A A186550 _R. H. Hardin_ Feb 23 2011