149670844domain: NAppears in sequencesGeneralized Bell numbers: row 3 of A090210.at n=5A069223Triangle of certain generalized Bell numbers.at n=30A090210a(n) arises in the normal ordering of n-th power of the operator (d/dx)(x(d/dx))^4.at n=3A157280Generalized vertical Bell numbers of order 4.at n=3A182924