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 A214348 #7 Jul 22 2025 23:14:37 %S A214348 5,65,1951,127813,17790765,5193620491,3160001994563,3995872591050989, %T A214348 10489950826300197841,57160724000127089232531 %N A214348 Number of nXnXn triangular 0..4 arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors. %C A214348 Column 4 of A214352 %e A214348 Some solutions for n=3 %e A214348 ....4......2......1......1......3......1......1......1......2......1......1 %e A214348 ...0.4....1.2....1.4....4.1....3.0....2.1....2.0....0.4....2.2....1.3....0.2 %e A214348 ..1.0.4..1.3.2..1.4.4..4.4.0..4.3.0..2.2.1..4.0.1..4.0.4..4.0.2..1.1.4..0.1.2 %K A214348 nonn %O A214348 1,1 %A A214348 _R. H. Hardin_ Jul 13 2012