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%I A155308 #3 Mar 31 2012 12:35:22
%S A155308 1,13,37,112,595,3710,30281,253489,2990675,42651723,721885534,
%T A155308 15178835272
%N A155308 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.
%e A155308 Maximal 13 X 13 X 13 example
%e A155308 ...............0
%e A155308 ..............0.0
%e A155308 .............1.1.0
%e A155308 ............0.0.1.0
%e A155308 ...........0.0.0.1.1
%e A155308 ..........0.1.1.0.0.1
%e A155308 .........0.1.0.0.1.0.0
%e A155308 ........1.1.0.0.0.1.1.0
%e A155308 .......1.0.0.0.0.0.0.1.0
%e A155308 ......0.0.1.0.0.1.0.0.1.1
%e A155308 .....0.1.1.0.1.1.0.1.0.0.0
%e A155308 ....0.1.0.0.1.0.0.0.1.1.1.0
%e A155308 ...1.1.0.1.1.0.0.0.0.0.0.1.1
%K A155308 nonn
%O A155308 5,2
%A A155308 _R. H. Hardin_ Jan 22 2009

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