Number of alternating permutations on [2n+1] with 1 in position n+1.

A362581

Number of alternating permutations on [2n+1] with 1 in position n+1.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =80a(4) =1750a(5) =64512a(6) =3438204a(7) =253913088a(8) =24687555750

External references