Number of polycubes of size n and symmetry class C.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =5a(6) =17a(7) =49a(8) =138a(9) =374a(10) =1062a(11) =2851a(12) =8010a(13) =21432a(14) =60142a(15) =161386a(16) =453253a(17) =1222110a(18) =3436564a(19) =9316409a(20) =26231463a(21) =71496106