Number of polycubes of size n and symmetry class F.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =3a(5) =6a(6) =26a(7) =72a(8) =241a(9) =623a(10) =2028a(11) =5374a(12) =16781a(13) =45094a(14) =138971a(15) =378196a(16) =1156028a(17) =3183390a(18) =9679303a(19) =26929415a(20) =81575661a(21) =228958790