Total number of palindromic primes in base 7 with n digits.

Terms

a(0) =3a(1) =0a(2) =6a(3) =0a(4) =41a(5) =0a(6) =154a(7) =0a(8) =931a(9) =0a(10) =4951a(11) =0a(12) =29932a(13) =0a(14) =180914a(15) =0a(16) =1089138a(17) =0a(18) =6823068a(19) =0a(20) =43644808a(21) =0a(22) =274927477a(23) =0