Total number of palindromic primes in base 8 below 8^n.

Terms

a(0) =4a(1) =4a(2) =17a(3) =17a(4) =64a(5) =64a(6) =375a(7) =375a(8) =2319a(9) =2319a(10) =15130a(11) =15130a(12) =99554a(13) =99554a(14) =675166a(15) =675166a(16) =4753617a(17) =4753617a(18) =33752394a(19) =33752394a(20) =239605153a(21) =239605153