Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 3,3 polyhexes in any orientation on a planar n X n X n triangular grid.
A155339
Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 3,3 polyhexes in any orientation on a planar n X n X n triangular grid.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =13a(4) =23a(5) =37a(6) =183a(7) =1053a(8) =5351a(9) =24397a(10) =99215a(11) =617661a(12) =5897471a(13) =64288141a(14) =714391583a(15) =7672307261a(16) =95370104207
External references
- oeis: A155339