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 A194504 #7 Jul 22 2025 12:34:18 %S A194504 7,343,118096,282475256,4747561509943,558545864083284007 %N A194504 Number of lower triangles of an n X n 0..7 array with each element unequal to the sum mod 8 of its horizontal and vertical neighbors. %C A194504 Column 7 of A194505 %e A194504 Some solutions for 3X3 %e A194504 ..2......3......7......0......6......0......3......6......5......4......7 %e A194504 ..7.1....4.2....4.2....6.4....4.4....2.4....5.2....4.4....1.0....2.3....4.4 %e A194504 ..6.4.1..4.3.1..2.3.6..1.7.4..5.2.5..4.3.0..6.3.7..0.7.4..0.2.1..7.6.0..0.6.0 %K A194504 nonn %O A194504 1,1 %A A194504 _R. H. Hardin_ Aug 27 2011