Table T(n,k) giving number of two-legged knot diagrams with n >= 0 self-intersections and k >= 0 tangencies, read by antidiagonals.

A067640

Table T(n,k) giving number of two-legged knot diagrams with n >= 0 self-intersections and k >= 0 tangencies, read by antidiagonals.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =8a(4) =20a(5) =10a(6) =42a(7) =174a(8) =210a(9) =70a(10) =260a(11) =1504a(12) =2992a(13) =2352a(14) =588a(15) =1796a(16) =13300a(17) =37100a(18) =47820a(19) =27720a(20) =5544a(21) =13396a(22) =120744a(23) =433620a(24) =784672a(25) =742296a(26) =339768a(27) =56628a(28) =105706a(29) =1122198

External references