Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 polyhexes in any orientation on a planar nXnXn triangular grid.
A155220
Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 polyhexes in any orientation on a planar nXnXn triangular grid.
Terms
- a(0) =1a(1) =4a(2) =10a(3) =19a(4) =109a(5) =692a(6) =3521a(7) =31519a(8) =398368a(9) =5171923a(10) =89984622a(11) =2185316954a(12) =63742209751
External references
- oeis: A155220