Number of palindromes of length n (in base 9).

Terms

a(0) =8a(1) =8a(2) =72a(3) =72a(4) =648a(5) =648a(6) =5832a(7) =5832a(8) =52488a(9) =52488a(10) =472392a(11) =472392a(12) =4251528a(13) =4251528a(14) =38263752a(15) =38263752a(16) =344373768a(17) =344373768a(18) =3099363912a(19) =3099363912a(20) =27894275208a(21) =27894275208a(22) =251048476872a(23) =251048476872