Number of rational knots of n crossings with signature 0 (chiral pairs counted twice).

Terms

a(0) =0a(1) =1a(2) =0a(3) =3a(4) =2a(5) =9a(6) =6a(7) =29a(8) =30a(9) =99a(10) =112a(11) =351a(12) =450a(13) =1275a(14) =1734a(15) =4707a(16) =6762a(17) =17577a(18) =26208a(19) =66197a(20) =101862a(21) =250953a(22) =395804a(23) =956385a(24) =1540110a(25) =3660541a(26) =5997600a(27) =14061141a(28) =23382294a(29) =54177741