A217504 - OEIS

%I #4 Oct 05 2012 05:56:30

%S 1,7,138,8353,1563486,896267399,1563576619949

%N Number of triangular nXnXn arrays of occupancy after each element either stays or moves to some neighbor and with no occupancy greater than 2

%C Column 2 of A217510

%e Some solutions for n=4

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

%e ....1.1......1.2......2.1......0.0......1.2......0.0......1.1......0.0

%e ...0.1.2....2.2.0....2.0.1....2.0.1....0.2.2....1.1.2....1.1.0....1.2.1

%e ..1.0.1.2..0.0.1.1..2.1.1.0..2.2.2.0..1.1.0.0..2.2.0.1..1.2.1.0..1.2.1.1

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 05 2012