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%I #6 Dec 18 2015 18:17:45
%S 7,22,114,888,10804,199988,5740166,251606900,17066691742,
%T 1770282323740,283975401794580,69694377176377328,26447798453646675184,
%U 15357128901797793996652,13788844798416302935620998
%N 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 Column 6 of A194998
%H R. H. Hardin, <a href="/A194996/b194996.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for 4X4
%e ..5........4........2........1........5........4........3........2
%e ..6.5......5.4......3.2......2.3......4.3......5.6......4.5......3.2
%e ..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 ..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 nonn
%O 1,1
%A _R. H. Hardin_ Sep 07 2011
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