Number of irreducible indecomposable bicolored immersions of unoriented circle into oriented sphere with n double points.

A268573

Number of irreducible indecomposable bicolored immersions of unoriented circle into oriented sphere with n double points.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =1a(4) =4a(5) =6a(6) =24a(7) =73a(8) =322a(9) =1274a(10) =5986a(11) =27750a(12) =135890a(13) =676263a(14) =3441088a(15) =17811771a(16) =93550146a(17) =497835030a(18) =2680159902a(19) =14577839412a(20) =80039631744a(21) =443164758244a(22) =247271664934

External references