Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.
A155354
Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =13a(4) =21a(5) =54a(6) =165a(7) =638a(8) =2331a(9) =9005a(10) =38668a(11) =204465a(12) =1227713a(13) =8257094a(14) =59762784a(15) =487017754a(16) =4487006412a(17) =47257428230a(18) =557362552428
External references
- oeis: A155354