Number of free linear midpoint-free polycubes of size n, identifying rotations and reflections.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =7a(6) =11a(7) =20a(8) =34a(9) =65a(10) =113a(11) =197a(12) =315a(13) =488a(14) =685a(15) =1002a(16) =1409a(17) =2019a(18) =2679a(19) =3667a(20) =4837a(21) =6558a(22) =8474a(23) =11018a(24) =13786a(25) =17882a(26) =22431a(27) =28918a(28) =36411a(29) =46905