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A155219 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 polyhexes in any orientation on a planar nXnXn triangular grid. 1

%I #5 May 19 2020 02:19:54

%S 1,4,10,45,176,1305,10079,117352,1561149,29980210,704867467,

%T 22571926686,912535595499,49246939684046,3416075823339525,

%U 312263317852780140

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

%e Maximal 13 X 13 X 13 example

%e ...............1

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

%e .............1.0.1

%e ............0.0.0.1

%e ...........1.1.1.0.1

%e ..........0.0.0.0.0.0

%e .........1.0.1.1.1.0.1

%e ........1.0.0.0.0.0.1.0

%e .......1.0.1.1.1.0.1.0.1

%e ......0.0.0.0.0.0.0.0.0.1

%e .....1.0.1.1.1.0.1.1.1.0.1

%e ....1.0.0.0.0.0.0.0.0.0.0.0

%e ...1.0.1.1.1.0.1.1.1.0.1.1.1

%K nonn,more,hard

%O 2,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified April 19 16:08 EDT 2024. Contains 371794 sequences. (Running on oeis4.)