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 A198660 #6 Jul 22 2025 13:03:42 %S A198660 6,3521,3053286,6046334324,17510670291958 %N A198660 Number of nX6 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 A198660 Column 6 of A198661 %e A198660 Some solutions with all values 0 to 7 for n=3 %e A198660 ..0..0..1..2..3..4....0..0..1..1..2..2....0..0..1..1..2..3....0..1..2..2..3..3 %e A198660 ..5..5..1..2..3..4....3..4..5..5..6..3....4..4..5..2..2..3....0..1..4..4..5..6 %e A198660 ..5..6..6..7..7..4....3..4..7..7..6..3....6..6..5..5..7..7....7..7..0..0..5..6 %K A198660 nonn %O A198660 1,1 %A A198660 _R. H. Hardin_ Oct 28 2011