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 A217998 #5 Jul 22 2025 23:46:25 %S A217998 241,59049,14345273,3486751263,847279307713 %N A217998 Number of nX5 arrays of the minimum or maximum value of corresponding elements and their horizontal and vertical neighbors in a random 0..2 nX5 array. %C A217998 Column 5 of A217999 %e A217998 Some solutions for n=3 %e A217998 ..0..0..0..0..1....0..1..2..0..2....0..2..2..1..1....0..0..1..1..0 %e A217998 ..0..0..0..1..1....0..0..2..1..1....0..0..0..0..2....0..0..0..1..1 %e A217998 ..0..2..2..0..1....0..0..0..2..0....0..1..0..2..0....0..1..0..2..2 %K A217998 nonn %O A217998 1,1 %A A217998 _R. H. Hardin_ Oct 17 2012