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

A155356

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

Terms

    a(0) =1a(1) =4a(2) =13a(3) =28a(4) =49a(5) =268a(6) =2207a(7) =13527a(8) =65442a(9) =532199a(10) =7461240a(11) =113949026a(12) =1537124321a(13) =25756946558a(14) =635120397887

External references