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 A264950 #5 Aug 12 2016 06:53:58 %S A264950 1,79008,8403205056,1122409297218768,173357342638694530002, %T A264950 29526013062983124375791088,5395269899168064415277849230476 %N A264950 Number of 7Xn arrays containing n copies of 0..7-1 with no equal horizontal neighbors and new values introduced sequentially from 0. %C A264950 Row 7 of A264945. %e A264950 Some solutions for n=2 %e A264950 ..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1 %e A264950 ..2..0....2..3....1..2....2..3....0..1....2..3....2..3....2..3....2..3....2..3 %e A264950 ..3..4....4..2....3..4....4..0....2..3....1..3....4..5....4..5....2..0....4..3 %e A264950 ..5..6....5..0....5..0....5..4....4..5....4..0....3..4....4..5....4..5....5..1 %e A264950 ..3..2....6..5....6..3....2..5....6..2....5..4....6..2....1..6....3..1....2..6 %e A264950 ..6..1....6..4....5..2....6..1....5..6....6..5....5..0....2..0....6..4....5..4 %e A264950 ..5..4....3..1....4..6....6..3....3..4....6..2....6..1....3..6....5..6....6..0 %Y A264950 Cf. A264945. %K A264950 nonn %O A264950 1,2 %A A264950 _R. H. Hardin_, Nov 29 2015