A217506 - OEIS

%I #3 Oct 05 2012 05:57:22

%S 1,10,342,44530,22155653,42007776880

%N Number of triangular nXnXn arrays of occupancy after each element either stays or moves to some neighbor and with no occupancy greater than 4

%C Column 4 of A217510

%e Some solutions for n=4

%e .....0........0........3........0........3........2........0........1

%e ....1.0......1.1......0.1......1.0......0.0......0.2......0.1......0.1

%e ...1.0.3....1.0.0....0.1.0....0.3.1....1.1.4....0.1.0....0.2.3....1.0.0

%e ..0.2.3.0..1.2.3.1..0.1.4.0..0.2.3.0..1.0.0.0..0.2.1.2..2.0.2.0..2.2.3.0

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 05 2012