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).
A260848
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).
Terms
- a(0) =1a(1) =2a(2) =1a(3) =6a(4) =6a(5) =1a(6) =21a(7) =64a(8) =36a(9) =0a(10) =99a(11) =559a(12) =772a(13) =108a(14) =0a(15) =588a(16) =5656a(17) =14544a(18) =7222a(19) =0a(20) =0a(21) =3829a(22) =56528a(23) =246092a(24) =277114a(25) =34680a(26) =0a(27) =0a(28) =27404a(29) =581511
External references
- oeis: A260848