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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
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%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