134399865601domain: NAppears in sequencesa(n) = Sum_{d|n} (n-1)!/(d-1)!.at n=14A087906a(n) = Sum_{d|n} (-1)^(n/d+1) * (n-1)!/(d-1)!.at n=14A352013a(n) = (n-1)! * Sum_{d|n} (-1)^(d+1) / (d-1)!.at n=14A363736