Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).

A121119

Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =12a(6) =24a(7) =113a(8) =232a(9) =1008a(10) =2122a(11) =8891a(12) =19110a(13) =78540a(14) =171694a(15) =697700a(16) =1546552a(17) =6240064a(18) =13992408a(19) =56192581a(20) =127231246a(21) =509314256a(22) =1162747842a(23) =4644046225a(24) =10677793584

External references