Number of dihedral primes with n digits.

Terms

a(0) =2a(1) =1a(2) =2a(3) =2a(4) =1a(5) =14a(6) =40a(7) =52a(8) =228a(9) =482a(10) =1592a(11) =4758a(12) =15810a(13) =53202a(14) =197429a(15) =725196