Number of polyominoes with n cells without holes that do not tile the plane.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =3a(7) =20a(8) =198a(9) =1390a(10) =9474a(11) =35488a(12) =178448a(13) =696371a(14) =2721544a(15) =10683110a(16) =41334494a(17) =155723774a(18) =596182769a(19) =2257379379a(20) =8587521496a(21) =32688629235a(22) =124568505590a(23) =475147925759