Number of irreducible indecomposable spherical curves with n crossings (only ordinary double points), the circle is oriented, the sphere is oriented (OO case).
A264761
Number of irreducible indecomposable spherical curves with n crossings (only ordinary double points), the circle is oriented, the sphere is oriented (OO case).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =6a(6) =17a(7) =73a(8) =290a(9) =1274a(10) =5844a(11) =27750a(12) =135192a(13) =676263a(14) =3437509a(15) =17811771a(16) =93531354a(17) =497835030a(18) =2680058068a(19) =14577839412a(20) =80039070868a(21) =443164758244
External references
- oeis: A264761