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 A271033 #3 Mar 29 2016 07:45:26 %S A271033 0,168,10164,535106,28658242,1610555756,95420380090,5945425725202, %T A271033 387907415514308,26381892105883904 %N A271033 Number of nXnXn triangular 0..7 arrays with some element less than a w, nw or ne neighbor exactly once. %C A271033 Column 7 of A271034. %e A271033 Some solutions for n=3 %e A271033 ....0......4......1......3......0......5......1......1......1......2......0 %e A271033 ...0.4....0.4....4.1....4.4....0.0....2.6....0.2....1.2....4.3....0.3....0.1 %e A271033 ..0.0.6..0.4.6..5.6.6..7.4.7..6.2.3..2.6.6..0.7.7..3.2.6..5.5.7..1.5.5..5.1.4 %Y A271033 Cf. A271034. %K A271033 nonn %O A271033 1,2 %A A271033 _R. H. Hardin_, Mar 29 2016