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 A206502 #6 Jul 22 2025 19:29:23 %S A206502 5,481,178998,83045488,38638317841 %N A206502 Number of nX5 0..7 arrays with no element equal to another within a city block distance of two, and new values 0..7 introduced in row major order. %C A206502 Column 5 of A206503 %e A206502 Some solutions for n=4 %e A206502 ..0..1..2..3..0....0..1..2..0..1....0..1..2..0..1....0..1..2..3..0 %e A206502 ..2..3..0..1..2....2..3..4..5..6....2..3..4..5..2....2..3..0..1..2 %e A206502 ..4..5..6..4..7....1..5..7..1..2....4..0..1..6..3....4..5..6..7..3 %e A206502 ..0..7..1..5..3....0..2..3..0..4....1..2..3..7..4....1..7..2..0..4 %K A206502 nonn %O A206502 1,1 %A A206502 _R. H. Hardin_ Feb 08 2012