Number of bicolored immersions of unoriented circle into oriented sphere with n double points.
A268561
Number of bicolored immersions of unoriented circle into oriented sphere with n double points.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =12a(4) =37a(5) =198a(6) =1143a(7) =7658a(8) =54559a(9) =413086a(10) =3251240a(11) =26484550a(12) =221714164a(13) =1900156948a(14) =16613990484a(15) =147816887598
External references
- oeis: A268561