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 A266136 #3 Dec 21 2015 12:32:38 %S A266136 1,544,9083,19750,326145,13689944,325554385,3901509248,74115297377, %T A266136 2013995093008,45630856227503,832426433462416 %N A266136 Number of 6Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself. %C A266136 Row 6 of A266131. %e A266136 Some solutions for n=4 %e A266136 ..0..1..1..0....0..0..0..0....0..0..0..1....1..0..2..1....2..1..1..0 %e A266136 ..2..2..1..1....1..2..2..1....1..2..2..1....0..2..0..1....0..1..1..2 %e A266136 ..2..1..0..2....1..1..2..3....0..2..1..0....1..0..2..0....2..3..2..2 %e A266136 ..2..1..1..2....0..0..2..0....0..2..0..2....1..2..2..1....2..1..1..0 %e A266136 ..1..0..1..2....0..2..0..1....3..2..1..1....0..2..0..1....2..1..0..2 %e A266136 ..0..2..0..1....1..0..1..1....0..2..1..0....0..0..1..1....1..0..1..1 %Y A266136 Cf. A266131. %K A266136 nonn %O A266136 1,2 %A A266136 _R. H. Hardin_, Dec 21 2015