Number of n-digit palindromes in base n.

Terms

a(0) =1a(1) =6a(2) =12a(3) =100a(4) =180a(5) =2058a(6) =3584a(7) =52488a(8) =90000a(9) =1610510a(10) =2737152a(11) =57921708a(12) =97883968a(13) =2392031250a(14) =4026531840a(15) =111612119056a(16) =187339329792