336600domain: NAppears in sequencesTriangle T(n,k) read by rows, where T(n,k) = number of times the permanent of a real singular n X n (0,1)-matrix takes the value k, for n >= 2, 0 <= k <= n!.at n=49A089481Numbers with prime factorization pqr^2s^2t^3.at n=16A190386