a(1) = 1, then a(n) = n*(n^(n-1)-1)*(n-2)!/(n-1).
A059522
a(1) = 1, then a(n) = n*(n^(n-1)-1)*(n-2)!/(n-1).
Terms
- a(0) =1a(1) =2a(2) =12a(3) =168a(4) =4680a(5) =223920a(6) =16470720a(7) =1725655680a(8) =244074902400
External references
- oeis: A059522
A059522
a(1) = 1, then a(n) = n*(n^(n-1)-1)*(n-2)!/(n-1).