479001613domain: NAppears in sequencesa(n) = (prime(n) - 1)! + prime(n).at n=5A100856a(n) = n! + n + 1.at n=12A213169a(n) = (n-1)! * Sum_{d|n} d^(n/d) / (d-1)!.at n=12A354849a(n) = (n-1)! * Sum_{d|n} d/(d-1)!.at n=12A370580a(n) = n! * Sum_{d|n} 1/((d-1)! * (n/d)^d).at n=12A370604