Number of polyominoes with 2n cells and exactly one line of reflection symmetry, where that one line is parallel to the grid and passes through the corner of at least one square.
A349329
Number of polyominoes with 2n cells and exactly one line of reflection symmetry, where that one line is parallel to the grid and passes through the corner of at least one square.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =7a(4) =28a(5) =100a(6) =368a(7) =1335a(8) =4912a(9) =18125a(10) =67477a(11) =252573a(12) =951363a(13) =3601113a(14) =13695150a(15) =52291510a(16) =200389661a(17) =770391542a(18) =2970337861a(19) =11482318605a(20) =44491635790a(21) =172766013959a(22) =672185703574
External references
- oeis: A349329