206543

Properties

Appears in sequences

• Number of immersions of an unoriented circle into the oriented sphere with n double points.at n=9A008987
• Triangle read by rows: T(n,g) = number of general immersions of a circle with n crossings in a surface of arbitrary genus g (the circle is not oriented, the surface is oriented).at n=36A260848
• Prime numbersat n=18516