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

A155316

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

Terms

    a(0) =1a(1) =4a(2) =10a(3) =19a(4) =34a(5) =64a(6) =439a(7) =3090a(8) =19210a(9) =101422a(10) =504509a(11) =4329846a(12) =55414347a(13) =830264641a(14) =12430929701a(15) =182359363367

External references