Number of alternating prime knots with n crossings.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =18a(8) =41a(9) =123a(10) =367a(11) =1288a(12) =4878a(13) =19536a(14) =85263a(15) =379799a(16) =1769979a(17) =8400285a(18) =40619385a(19) =199631989a(20) =990623857a(21) =4976016485a(22) =25182878921a(23) =128564665125