a(1) = 1; for n>1, a(n) = smallest number not included earlier such that each P+1 is prime, where P is the product of an (n-1)-set from the previous n terms.

A086554

a(1) = 1; for n>1, a(n) = smallest number not included earlier such that each P+1 is prime, where P is the product of an (n-1)-set from the previous n terms.