Total number of palindromic primes in base 9 below 9^n.

Terms

a(0) =4a(1) =4a(2) =17a(3) =17a(4) =81a(5) =81a(6) =499a(7) =499a(8) =3416a(9) =3416a(10) =24255a(11) =24255a(12) =181998a(13) =181998a(14) =1428698a(15) =1428698a(16) =11139859a(17) =11139859a(18) =89160415a(19) =89160415