Number of alternating runs in all permutations of [n] (the permutation 732569148 has four alternating runs: 732, 2569, 91 and 148).

A097971

Number of alternating runs in all permutations of [n] (the permutation 732569148 has four alternating runs: 732, 2569, 91 and 148).

Terms

    a(0) =2a(1) =10a(2) =56a(3) =360a(4) =2640a(5) =21840a(6) =201600a(7) =2056320a(8) =22982400a(9) =279417600a(10) =3672345600a(11) =51891840000a(12) =784604620800

External references