Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 5,4 5,5 polyhexes in any orientation on a planar n X n X n triangular grid.
A155402
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 5,4 5,5 polyhexes in any orientation on a planar n X n X n triangular grid.
Terms
- a(0) =1a(1) =4a(2) =10a(3) =22a(4) =40a(5) =161a(6) =580a(7) =2088a(8) =9630a(9) =52661a(10) =324848a(11) =2048063a(12) =15783536a(13) =139241607a(14) =1379819761
External references
- oeis: A155402