A059521 a(1) = 5; thereafter write the cubes of each element in order.

5, 1, 2, 5, 1, 8, 1, 2, 5, 1, 5, 1, 2, 1, 8, 1, 2, 5, 1, 1, 2, 5, 1, 8, 1, 5, 1, 2, 1, 8, 1, 2, 5, 1, 1, 8, 1, 2, 5, 1, 5, 1, 2, 1, 1, 2, 5, 1, 8, 1, 5, 1, 2, 1, 8, 1, 2, 5, 1, 1, 5, 1, 2, 1, 8, 1, 2, 5, 1, 1, 2, 5, 1, 8, 1, 1, 8, 1, 2, 5, 1, 5, 1, 2, 1, 1, 2, 5, 1, 8, 1, 5, 1, 2, 1, 8, 1, 2, 5