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%I #3 Mar 31 2012 12:35:22
%S 1,4,13,28,111,502,2990,22461,175998,1776694,23271927,358397754,
%T 6862062854,158641875413,4463737522965,156583615357383
%N Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.
%C Same series for 0,0 1,0 1,1 2,0 2,1 3,0 3,1 polyhexes.
%e Maximal 10 X 10 X 10 example
%e ............1
%e ...........1.1
%e ..........0.0.1
%e .........1.0.1.1
%e ........1.1.0.0.0
%e .......1.0.0.1.1.0
%e ......1.1.0.0.1.0.0
%e .....0.0.0.1.1.0.0.0
%e ....1.0.1.0.1.0.1.0.1
%e ...1.1.1.1.0.0.1.1.1.1
%K nonn
%O 3,2
%A _R. H. Hardin_ Jan 22 2009
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