Number of prime knots with n crossings.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =21a(8) =49a(9) =165a(10) =552a(11) =2176a(12) =9988a(13) =46972a(14) =253293a(15) =1388705a(16) =8053393a(17) =48266466a(18) =294130458