Free polyominoes with 2n squares, having reflectional symmetry on axis that coincides with edges.
A234006
Free polyominoes with 2n squares, having reflectional symmetry on axis that coincides with edges.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =11a(4) =35a(5) =114a(6) =392a(7) =1381a(8) =4998a(9) =18292a(10) =67791a(11) =253182a(12) =952527a(13) =3603389a(14) =13699516a(15) =52300071a(16) =200406183a(17) =770424072a(18) =2970400815a(19) =11482442855a(20) =44491876993a(21) =172766491178a(22) =672186631950
External references
- oeis: A234006