A195247 - OEIS

%I #5 Dec 18 2015 18:17:45

%S 8,122,5870,886084,421064386,631149414120,2987571816007840,

%T 44691981426014450274,2113939963847059814381026,

%U 316271939439306387096992492956,149706956331711946010383809151524932

%N Number of lower triangles of an n X n 0..7 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

%C Column 7 of A195248

%e Some solutions for n=5

%e ..0..........1..........6..........0..........7..........4..........4

%e ..1.2........3.3........5.5........0.2........5.6........4.6........6.6

%e ..2.1.1......2.1.3......6.6.7......1.1.2......4.6.7......5.5.4......5.4.5

%e ..0.0.2.2....3.3.3.4....7.7.7.6....2.0.1.0....5.5.7.5....7.6.6.4....4.4.3.4

%e ..0.1.0.1.1..2.3.3.2.2..7.7.7.6.4..1.0.2.0.2..4.5.7.7.5..6.6.5.4.3..4.3.2.3.2

%K nonn

%O 1,1

%A _R. H. Hardin_ Sep 13 2011