3713700domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1) * A026626(n,k).at n=18A026965a(0) = 1; a(n+1) is the smallest number not in the sequence such that a(n+1) - Sum_{i=1..n} a(i) divides a(n+1) - Product_{i=1..n} a(i).at n=31A254343