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 A214357 #8 Jul 22 2025 23:15:28 %S A214357 284724,293207907,49555044358,3160001994563,107180513854464, %T A214357 2318511875463567,35699489509054494,420636918387554285, %U A214357 3989623026879608554,31608512602702469537,215115456420213959696 %N A214357 Number of 7X7X7 triangular 0..n arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors. %C A214357 Row 7 of A214352 %H A214357 R. H. Hardin, <a href="/A214357/b214357.txt">Table of n, a(n) for n = 1..13</a> %e A214357 Some solutions for n=1 %e A214357 ........0..............0..............0..............0..............0 %e A214357 .......0.1............0.0............0.0............0.1............0.0 %e A214357 ......0.1.0..........0.0.0..........0.0.0..........0.1.1..........1.0.0 %e A214357 .....0.1.0.0........1.0.1.0........0.1.0.1........0.0.1.1........1.1.0.1 %e A214357 ....0.0.1.0.0......1.0.1.1.0......0.1.1.0.1......0.0.1.1.0......1.1.0.0.1 %e A214357 ...1.0.1.0.0.1....1.1.0.1.1.0....0.1.1.0.1.1....1.0.1.1.0.0....1.1.0.0.1.1 %e A214357 ..0.1.0.1.0.1.0..1.1.0.0.1.0.0..0.0.1.0.1.0.1..1.0.1.0.1.0.0..0.1.0.1.0.1.1 %K A214357 nonn %O A214357 1,1 %A A214357 _R. H. Hardin_ Jul 13 2012