Number of runs of length 1 in all permutations of [n]. (The permutation 3574162 has two runs of length 1: 357/4/16/2.)

A097900

Number of runs of length 1 in all permutations of [n]. (The permutation 3574162 has two runs of length 1: 357/4/16/2.)

Terms

    a(0) =1a(1) =2a(2) =7a(3) =32a(4) =180a(5) =1200a(6) =9240a(7) =80640a(8) =786240a(9) =8467200a(10) =99792000a(11) =1277337600a(12) =17643225600a(13) =261534873600

External references