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Number of nXnXn triangular 0..3 arrays with no element equal to the sum mod 4 of any two neighbors
1

%I #6 Mar 31 2012 12:36:21

%S 4,36,95,1169,33801,2107545,268584665,68722397483,35184451704151,

%T 36028800045063009,73786976454230149101,302231454915324617869969,

%U 2475880078571947551781268217,40564819207303508564612061601737

%N Number of nXnXn triangular 0..3 arrays with no element equal to the sum mod 4 of any two neighbors

%H R. H. Hardin, <a href="/A193183/b193183.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for 4X4X4

%e .....3........1........1........3........3........3........3........2

%e ....3.3......2.2......3.3......1.3......3.3......1.1......3.1......2.2

%e ...1.1.3....2.3.2....3.1.3....3.1.3....3.1.1....1.1.1....3.3.1....1.2.2

%e ..3.1.1.1..2.2.2.2..3.1.1.1..3.3.1.3..1.3.3.1..3.1.1.3..1.1.3.3..2.2.2.2

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 17 2011