Number of rooted 2-dimensional polyominoes with n square cells, with no symmetries removed.

A048664

Number of rooted 2-dimensional polyominoes with n square cells, with no symmetries removed.

Terms

    a(0) =1a(1) =4a(2) =18a(3) =76a(4) =315a(5) =1296a(6) =5320a(7) =21800a(8) =89190a(9) =364460a(10) =1487948a(11) =6070332a(12) =24750570a(13) =100868236a(14) =410919990a(15) =1673486992a(16) =6813529348a(17) =27734769756a(18) =112874034844a(19) =459295593200

External references