a(n) = a(n-1)*b(n-2)+2, b() given by A029758.

A029846

a(n) = a(n-1)*b(n-2)+2, b() given by A029758.

Terms

    a(0) =1a(1) =3a(2) =5a(3) =7a(4) =23a(5) =347a(6) =109307a(7) =11878938227

External references