Number of permutations of length 2*n-1 with no local maxima or minima in even positions.

A122647

Number of permutations of length 2*n-1 with no local maxima or minima in even positions.

Terms

    a(0) =1a(1) =2a(2) =14a(3) =204a(4) =5104a(5) =195040a(6) =10570416a(7) =771171296a(8) =72871890176

External references