%I #5 Dec 18 2015 18:17:44
%S 1,3,34,3936,1797696,2054111040,5741390328960,39210440893622016
%N Number of lower triangles of an n X n 0..5 array with new values introduced in row major order 0..5 and no two horizontal or vertical neighbors of any element equal
%C Column 5 of A194893
%e Some solutions for 4X4
%e ..0........0........0........0........0........0........0........0
%e ..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
%e ..1.3.4....3.4.1....1.3.4....3.2.1....3.3.4....3.2.1....3.0.1....3.3.4
%e ..0.0.4.1..5.5.2.0..2.3.5.2..0.0.1.2..0.1.1.0..3.4.5.0..3.4.4.3..2.1.0.5
%K nonn
%O 1,2
%A _R. H. Hardin_ Sep 04 2011