a(0) = 1, a(n+1) = (a(n)-th prime) + 1.

Terms

a(0) =1a(1) =3a(2) =6a(3) =14a(4) =44a(5) =194a(6) =1182a(7) =9548a(8) =99524a(9) =1292832a(10) =20374364a(11) =380964632a(12) =8300770764a(13) =207647281344