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 A217452 #12 Jun 22 2022 12:10:47 %S A217452 9,69,613,4361,35067,271863,2122623,16577231,129398981,1010161409, %T A217452 7886865189,61570433261,480690831603,3752745812035,29297882184787, %U A217452 228729463311571,1785699822954649,13941021624348057,108838075075791297 %N A217452 Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal and vertical neighbors in a random 0..2 n X 3 array. %C A217452 Column 3 of A217457. %H A217452 R. H. Hardin, <a href="/A217452/b217452.txt">Table of n, a(n) for n = 1..43</a> %e A217452 Some solutions for n=3: %e A217452 ..0..0..1....2..1..2....0..2..2....0..1..1....2..1..1....2..0..0....2..0..0 %e A217452 ..0..0..0....1..1..1....0..0..2....0..0..2....1..1..1....0..0..0....0..0..0 %e A217452 ..1..0..0....1..1..2....0..0..2....0..0..2....2..1..2....2..0..1....2..0..0 %Y A217452 Cf. A217457. %K A217452 nonn %O A217452 1,1 %A A217452 _R. H. Hardin_, Oct 03 2012