2359294domain: NAppears in sequencesa(3) = 1, otherwise a(n) = n*2^(n-3) - 2^(n-2) - 2.at n=17A058966Number of palindromes (in base 8) below 8^n.at n=12A117867a(n) = 9*4^n - 2.at n=8A153465a(n) = 9*2^n - 2.at n=18A176449