Number of prime alternating tangles (or knots) with two connected components.
A067646
Number of prime alternating tangles (or knots) with two connected components.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =24a(5) =72a(6) =264a(7) =1074a(8) =4490a(9) =20296a(10) =92768a(11) =439148a(12) =2118654a(13) =10377708a(14) =51740280a(15) =260545092a(16) =1328891356a(17) =6836872181
External references
- oeis: A067646