94951548840domain: NAppears in sequencesa(n) = Sum_{k=0..n-1} Bell(k), where the Bell numbers Bell(k) are given in A000110.at n=18A005001Numerator of Sum_{i=0..n-1} B(i)/B(n), where B(i) = A000110(i) are the Bell numbers.at n=18A192986