%I #3 Mar 31 2012 12:35:23
%S 1,4,13,28,49,76,487,3766,20956,91261,385483,3099937,40032793,
%T 511624885,5661397930,61479664849,927273309259,20003424034360,
%U 509150633289499,13132668672579046,346049894030528596
%N Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,2 3,0 3,3 4,1 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............0
%e ...........0.0
%e ..........1.1.1
%e .........1.0.0.1
%e ........0.0.0.1.0
%e .......0.0.1.1.0.0
%e ......1.1.0.0.0.1.1
%e .....1.0.0.0.0.0.0.1
%e ....1.0.0.1.0.1.0.0.1
%e ...0.1.1.1.0.0.1.1.1.0
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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