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 A198659 #6 Jul 22 2025 13:03:35 %S A198659 3,488,98467,40065880,22693251873,17510670291958 %N A198659 Number of nX5 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor. %C A198659 Column 5 of A198661 %e A198659 Some solutions with all values 0 to 7 for n=4 %e A198659 ..0..1..1..1..2....0..1..1..2..3....0..1..1..2..2....0..1..2..3..4 %e A198659 ..0..2..3..4..2....0..4..1..2..3....0..3..3..2..0....0..1..2..3..4 %e A198659 ..2..2..3..4..5....4..4..5..6..7....4..5..6..6..0....5..6..7..7..4 %e A198659 ..6..6..7..7..5....2..2..5..6..7....4..5..5..7..7....5..6..7..3..3 %K A198659 nonn %O A198659 1,1 %A A198659 _R. H. Hardin_ Oct 28 2011