Table array: T(n,k) is Ann_k(2*n+k,k) where Ann_k(n,m) is the number of annular non-crossing matchings of type (n, m) with precisely k cross-cuts.

A267998

Table array: T(n,k) is Ann_k(2*n+k,k) where Ann_k(n,m) is the number of annular non-crossing matchings of type (n, m) with precisely k cross-cuts.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =1a(8) =2a(9) =4a(10) =1a(11) =1a(12) =3a(13) =5a(14) =10a(15) =1a(16) =1a(17) =3a(18) =7a(19) =14a(20) =26a(21) =1a(22) =1a(23) =4a(24) =10a(25) =22a(26) =42a(27) =80a(28) =1a(29) =1

External references