Number of permutations of [2n+1] with exactly n rising or falling successions.

A322296

Number of permutations of [2n+1] with exactly n rising or falling successions.

Terms

    a(0) =1a(1) =4a(2) =48a(3) =888a(4) =22120a(5) =685368a(6) =25344480a(7) =1087931184a(8) =53138966904

External references