a(n) = n!*Sum_{m=1..floor((n+1)/2)} 1/(m*binomial(n-m,m-1)).
A358652
a(n) = n!*Sum_{m=1..floor((n+1)/2)} 1/(m*binomial(n-m,m-1)).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =30a(4) =180a(5) =890a(6) =7084a(7) =47544a(8) =478512a(9) =4103712a(10) =50079744a(11) =525568032a(12) =7531512768a(13) =93697680960
External references
- oeis: A358652