Number of nontrivial Baxter permutations of length 2n-1.

A001183

Number of nontrivial Baxter permutations of length 2n-1.

Terms

    a(0) =0a(1) =2a(2) =2a(3) =18a(4) =66a(5) =374a(6) =1694a(7) =9822a(8) =51698

External references