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 A155315 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0

%I

%S 1,7,19,37,61,503,4407,23093,93285,817543,14192015,204195517,

%T 2243020429,32774055967,863753860919,27738606644581,798910205504069,

%U 24797177099870103

%N Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.

%C Same series for 1,1 2,0 2,1 2,2 3,1 3,3 4,2 polyhexes.

%e Maximal 9 X 9 X 9 example

%e ...........0

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

%e .........1.1.1

%e ........1.1.0.0

%e .......0.0.1.0.0

%e ......0.0.0.0.0.1

%e .....1.1.1.0.1.1.1

%e ....0.1.1.0.0.0.1.1

%e ...0.1.0.1.0.0.1.0.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified December 9 14:35 EST 2022. Contains 358700 sequences. (Running on oeis4.)