Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 4.
A066281
Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 4.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =3a(6) =5a(7) =11a(8) =11a(9) =24a(10) =35a(11) =84a(12) =92a(13) =174a(14) =254a(15) =606a(16) =658a(17) =1255a(18) =1769a(19) =4353a(20) =4667a(21) =9131
External references
- oeis: A066281