Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 3.
A066273
Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 3.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =4a(7) =0a(8) =3a(9) =24a(10) =4a(11) =18a(12) =151a(13) =25a(14) =136a(15) =992a(16) =184a(17) =938a(18) =6769a(19) =1300a(20) =6792a(21) =47469
External references
- oeis: A066273