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 A218174 #7 Jul 22 2025 23:48:54 %S A218174 4,28,2936,851332,1661620524,15513264742256 %N A218174 Number of n X n arrays of the minimum value of corresponding elements and their horizontal and vertical neighbors in a random 0..3 n X n array. %C A218174 Diagonal of A218181 %e A218174 Some solutions for n=3 %e A218174 ..0..0..1....3..1..2....2..2..3....3..3..3....0..0..2....3..0..0....0..0..2 %e A218174 ..0..0..0....0..1..1....1..0..0....0..3..2....0..0..2....2..1..0....0..2..2 %e A218174 ..3..0..2....0..0..1....0..0..0....0..0..2....0..2..3....2..0..0....1..1..2 %K A218174 nonn %O A218174 1,1 %A A218174 _R. H. Hardin_ Oct 22 2012