a(1) = 1 and thereafter a(n) = 2*prime(a(n-1)).

A352289

a(1) = 1 and thereafter a(n) = 2*prime(a(n-1)).

Terms

    a(0) =1a(1) =4a(2) =14a(3) =86a(4) =886a(5) =13766a(6) =298154a(7) =8455786a(8) =300427382a(9) =12942000398a(10) =659492202274

External references