Number of palindromes (in base 9) below 9^n.

Terms

a(0) =8a(1) =16a(2) =88a(3) =160a(4) =808a(5) =1456a(6) =7288a(7) =13120a(8) =65608a(9) =118096a(10) =590488a(11) =1062880a(12) =5314408a(13) =9565936a(14) =47829688a(15) =86093440a(16) =430467208a(17) =774840976a(18) =3874204888a(19) =6973568800a(20) =34867844008a(21) =62762119216a(22) =313810596088a(23) =564859072960