Number of fixed midpoint-free polycubes of size n.

Terms

a(0) =1a(1) =3a(2) =12a(3) =47a(4) =168a(5) =532a(6) =1344a(7) =2707a(8) =5064a(9) =11236a(10) =24768a(11) =53614a(12) =112464a(13) =222564a(14) =411008a(15) =723884a(16) =1263696a(17) =2236452a(18) =3953448a(19) =6855498a(20) =11544816a(21) =18880992a(22) =30104592a(23) =46815126a(24) =70776080a(25) =103864092a(26) =148069152a(27) =205499496a(28) =278917752a(29) =373204912