Number of fixed polyominoes with n cells that have a diagonal axis of symmetry going from lower left to upper right.

A346800

Number of fixed polyominoes with n cells that have a diagonal axis of symmetry going from lower left to upper right.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =1a(4) =5a(5) =4a(6) =16a(7) =13a(8) =54a(9) =46a(10) =186a(11) =167a(12) =660a(13) =612a(14) =2384a(15) =2267a(16) =8726a(17) =8464a(18) =32278a(19) =31822a(20) =120419a(21) =120338a(22) =452420a(23) =457320a(24) =1709845a(25) =1745438a(26) =6494848a(27) =6686929a(28) =24779026a(29) =25703792

External references