%I A155347
%S A155347 1,7,19,52,178,691,3685,20423,128624,1025960,9573074,102844369
%N A155347 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 
               5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular 
               grid.
%e A155347 Maximal 12 X 12 X 12 example
%e A155347 ..............0
%e A155347 .............0.0
%e A155347 ............0.0.0
%e A155347 ...........1.1.0.0
%e A155347 ..........0.0.1.1.0
%e A155347 .........0.0.0.0.1.1
%e A155347 ........0.0.1.1.0.0.1
%e A155347 .......0.1.1.0.0.1.0.0
%e A155347 ......1.1.0.0.1.1.0.0.1
%e A155347 .....1.0.0.1.1.0.0.1.1.0
%e A155347 ....0.0.1.1.0.0.1.1.0.0.0
%e A155347 ...0.0.0.0.0.1.1.0.0.0.0.0
%Y A155347 Sequence in context: A100545 A100450 A155423 this_sequence A155385 A155345 
               A155309
%Y A155347 Adjacent sequences: A155344 A155345 A155346 this_sequence A155348 A155349 
               A155350
%K A155347 nonn
%O A155347 6,2
%A A155347 Ron Hardin (rhhardin(AT)att.net) Jan 22 2009