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Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0

%I #3 Mar 31 2012 12:35:22

%S 1,4,10,19,54,346,1831,9221,66079,717157,8272905,104484553,1712695513,

%T 36940968544,931841300560,27497789520438,1009266090959240,

%U 46345568210962143

%N Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 11 X 11 X 11 example

%e .............0

%e ............1.0

%e ...........1.1.1

%e ..........0.0.1.0

%e .........0.0.0.0.0

%e ........1.1.0.0.0.1

%e .......0.1.0.0.1.1.1

%e ......0.1.1.0.0.1.0.0

%e .....1.0.0.0.1.0.0.1.1

%e ....1.1.1.0.1.1.1.0.1.0

%e ...0.0.1.0.0.0.1.0.1.1.0

%K nonn

%O 3,2

%A _R. H. Hardin_ Jan 22 2009