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 A194996 #8 Jul 22 2025 12:39:43 %S A194996 7,22,114,888,10804,199988,5740166,251606900,17066691742, %T A194996 1770282323740,283975401794580,69694377176377328,26447798453646675184, %U A194996 15357128901797793996652,13788844798416302935620998 %N A194996 Number of lower triangles of an n X n 0..6 array with each element differing from all of its horizontal and vertical neighbors by one. %C A194996 Column 6 of A194998 %H A194996 R. H. Hardin, <a href="/A194996/b194996.txt">Table of n, a(n) for n = 1..22</a> %e A194996 Some solutions for 4X4 %e A194996 ..5........4........2........1........5........4........3........2 %e A194996 ..6.5......5.4......3.2......2.3......4.3......5.6......4.5......3.2 %e A194996 ..5.4.3....4.5.4....2.1.2....3.4.3....3.4.3....4.5.6....3.4.5....4.3.4 %e A194996 ..4.5.4.3..3.4.5.6..1.2.1.0..4.3.2.3..2.3.4.5..5.6.5.4..4.5.6.5..5.4.3.4 %K A194996 nonn %O A194996 1,1 %A A194996 _R. H. Hardin_ Sep 07 2011