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 A214347 #7 Jul 22 2025 23:14:31 %S A214347 4,36,660,23554,1602092,205613460,49555044358,22380167899116, %T A214347 18924317057007778,29956465204908956664,88786379727557659524194 %N A214347 Number of nXnXn triangular 0..3 arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors. %C A214347 Column 3 of A214352 %e A214347 Some solutions for n=3 %e A214347 ....0......1......1......0......0......1......2......1......3......2......3 %e A214347 ...0.1....3.1....1.2....1.0....1.0....0.3....2.1....3.1....3.2....2.1....3.1 %e A214347 ..0.0.3..3.2.1..1.0.2..1.2.0..1.0.1..0.3.3..1.3.1..3.0.2..2.3.0..3.2.0..3.0.2 %K A214347 nonn %O A214347 1,1 %A A214347 _R. H. Hardin_ Jul 13 2012