Sum over the genera g of the number of immersions of an oriented circle with n crossings in an unoriented surface of genus g.
A260887
Sum over the genera g of the number of immersions of an oriented circle with n crossings in an unoriented surface of genus g.
Terms
- a(0) =1a(1) =3a(2) =14a(3) =120a(4) =1556a(5) =27974a(6) =618824a(7) =16223180a(8) =490127050a(9) =16761331644a(10) =639969571892
External references
- oeis: A260887