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A195245 Number of lower triangles of an n X n 0..5 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.

%I A195245 #8 Jul 22 2025 12:42:10
%S A195245 6,84,3776,533142,237368212,333437946202,1479091549959182,
%T A195245 20728220266936919766,918037571811526229736636,
%U A195245 128523191925989407344147529338,56883358880979630186940014533369490
%N A195245 Number of lower triangles of an n X n 0..5 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.
%C A195245 Column 5 of A195248
%H A195245 R. H. Hardin, <a href="/A195245/b195245.txt">Table of n, a(n) for n = 1..12</a>
%e A195245 Some solutions for n=5
%e A195245 ..4..........2..........2..........1..........1..........3..........4
%e A195245 ..2.4........2.4........1.2........3.1........2.3........2.2........3.4
%e A195245 ..2.3.5......3.3.3......3.2.0......3.2.2......3.3.4......2.3.2......3.4.2
%e A195245 ..4.4.5.4....2.2.3.4....4.2.0.2....3.4.3.2....5.3.4.4....1.1.3.4....4.4.3.2
%e A195245 ..4.5.3.5.3..4.4.2.2.3..2.2.1.0.1..4.3.2.4.4..5.4.5.3.2..2.2.2.4.3..5.4.2.3.3
%K A195245 nonn
%O A195245 1,1
%A A195245 _R. H. Hardin_ Sep 13 2011