Number of polyominoes with n cells that tile the plane.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =35a(6) =104a(7) =343a(8) =1050a(9) =3070a(10) =6620a(11) =23449a(12) =38669a(13) =109104a(14) =279583a(15) =546893a(16) =827035a(17) =3057332a(18) =3381124a(19) =12126683a(20) =21921192a(21) =37008138a(22) =53327764a(23) =220908809a(24) =271293803