A043069 a(n)=(s(n)+3)/8, where s(n)=n-th base 8 palindrome that starts with 5.

1, 6, 41, 42, 43, 44, 45, 46, 47, 48, 321, 330, 339, 348, 357, 366, 375, 384, 2561, 2569, 2577, 2585, 2593, 2601, 2609, 2617, 2626, 2634, 2642, 2650, 2658, 2666, 2674, 2682, 2691, 2699, 2707, 2715, 2723, 2731, 2739, 2747