%I #4 Mar 31 2012 12:36:21

%S 0,5,21,613,52762,11259545,6420980857,9905776786313,41165813245599155

%N Number of nXnXn triangular 0..2 arrays with each element equal to the product mod 3 of two neighbors

%e Some solutions for 4X4X4

%e .....0........0........1........1........1........0........2........1

%e ....0.0......0.1......1.1......2.2......2.2......0.2......2.1......1.1

%e ...1.2.2....1.1.1....1.1.2....0.1.1....1.2.2....1.2.1....0.0.1....1.1.1

%e ..1.1.1.2..1.1.2.2..1.1.2.1..0.0.2.2..2.2.2.1..2.2.1.1..0.0.2.2..2.2.1.1

%K nonn

%O 1,2

%A _R. H. Hardin_ Jul 22 2011