Number of immersions of the unoriented circle into the unoriented plane with n double points.
A008983
Number of immersions of the unoriented circle into the unoriented plane with n double points.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =20a(4) =82a(5) =435a(6) =2645a(7) =18489a(8) =141326a(9) =1153052a(10) =9819315a(11) =86305315a(12) =776868505
External references
- oeis: A008983