A155331 - OEIS

A155331

Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 5,0 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.

%I #5 Oct 02 2025 21:56:48

%S 1,4,13,28,131,616,2577,12364,77884,560672,4490012,45293635,525483762

%N Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 5,0 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 9 X 9 X 9 example

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

%e ..........1.1

%e .........1.0.0

%e ........1.0.1.1

%e .......1.0.0.0.1

%e ......1.0.0.0.0.1

%e .....0.1.0.0.0.0.1

%e ....1.0.0.0.0.1.0.1

%e ...0.1.1.1.1.1.0.1.0

%K nonn

%O 5,2

%A _R. H. Hardin_, Jan 22 2009