Number of Baxter permutations of length n (also called Baxter numbers).

A001181

Number of Baxter permutations of length n (also called Baxter numbers).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =92a(6) =422a(7) =2074a(8) =10754a(9) =58202a(10) =326240a(11) =1882960a(12) =11140560a(13) =67329992a(14) =414499438a(15) =2593341586a(16) =16458756586a(17) =105791986682a(18) =687782586844

External references