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 oriented, the surface is unoriented).
A260885
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 oriented, the surface is unoriented).
Terms
- a(0) =1a(1) =2a(2) =1a(3) =6a(4) =6a(5) =2a(6) =21a(7) =62a(8) =37a(9) =0a(10) =97a(11) =559a(12) =788a(13) =112a(14) =0a(15) =579a(16) =5614a(17) =14558a(18) =7223a(19) =0a(20) =0a(21) =3812a(22) =56526a(23) =246331a(24) =277407a(25) =34748a(26) =0a(27) =0a(28) =27328a(29) =580860
External references
- oeis: A260885