Number of n-crossing links with alternating braids of 3 strands.

Terms

a(0) =1a(1) =1a(2) =4a(3) =5a(4) =13a(5) =18a(6) =38a(7) =57a(8) =115a(9) =183a(10) =354a(11) =604a(12) =1153a(13) =2047a(14) =3904a(15) =7145a(16) =13637a(17) =25471a(18) =48722a(19) =92193