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 A266134 #4 Dec 21 2015 12:31:35 %S A266134 1,61,385,572,3851,44623,347576,1650710,12360130,106235031,807578953, %T A266134 5406175833,41246496374,328408364493,2509089355110,18435763834038, %U A266134 141054581587168,1100340622468942,8442342552511565,63751061176641632 %N A266134 Number of 4Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself. %C A266134 Row 4 of A266131. %H A266134 R. H. Hardin, <a href="/A266134/b266134.txt">Table of n, a(n) for n = 1..210</a> %e A266134 Some solutions for n=4 %e A266134 ..0..1..1..0....0..0..0..0....1..0..1..2....1..2..0..1....2..1..1..0 %e A266134 ..2..3..2..2....1..2..2..0....1..1..1..2....1..0..2..0....0..1..1..2 %e A266134 ..2..1..1..0....1..1..0..1....1..1..0..1....2..1..0..0....1..2..2..1 %e A266134 ..2..1..0..1....1..0..2..0....1..0..2..0....2..1..2..0....0..0..0..0 %Y A266134 Cf. A266131. %K A266134 nonn %O A266134 1,2 %A A266134 _R. H. Hardin_, Dec 21 2015