Number of polyominoes with n cells that tile the plane by translation.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =9a(5) =24a(6) =41a(7) =121a(8) =213a(9) =522a(10) =783a(11) =2712a(12) =3179a(13) =8672a(14) =16621a(15) =37415a(16) =48558a(17) =154660a(18) =185007a(19) =573296a(20) =876633a(21) =1759730a(22) =2606543a(23) =8768743a(24) =10774339