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 A194503 #7 Jul 22 2025 12:34:12 %S A194503 6,216,46872,60466140,470184984576,21936950640377856 %N A194503 Number of lower triangles of an n X n 0..6 array with each element unequal to the sum mod 7 of its horizontal and vertical neighbors. %C A194503 Column 6 of A194505 %e A194503 Some solutions for 3X3 %e A194503 ..1......3......6......0......1......2......5......0......4......2......4 %e A194503 ..2.2....4.6....3.2....5.6....0.3....5.2....4.1....6.2....5.5....0.1....1.3 %e A194503 ..5.2.3..6.0.5..4.0.6..3.3.6..0.5.3..3.2.1..0.2.6..1.6.5..6.6.1..5.2.0..4.1.6 %K A194503 nonn %O A194503 1,1 %A A194503 _R. H. Hardin_ Aug 27 2011