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 A214534 #6 Jul 22 2025 23:16:47 %S A214534 3,5,15,93,1007,17213,461465,19166997,1246538209,126946385993, %T A214534 20342860627393,5148359000639457 %N A214534 Number of nXnXn triangular 0..2 arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors, and every horizontal row having the same average value. %C A214534 Column 2 of A214540 %e A214534 Some solutions for n=4 %e A214534 .....1........1........1........1........1........1........1........1 %e A214534 ....1.1......2.0......2.0......0.2......1.1......0.2......0.2......1.1 %e A214534 ...2.0.1....2.0.1....1.2.0....0.2.1....2.0.1....1.0.2....1.0.2....2.0.1 %e A214534 ..1.2.0.1..1.2.0.1..1.2.0.1..0.2.1.1..0.2.0.2..0.2.0.2..1.0.1.2..2.0.1.1 %K A214534 nonn %O A214534 1,1 %A A214534 _R. H. Hardin_ Jul 20 2012