Hello SeqFans, For n>2, a(n) is the product of the last 2 digits of S and S is the lexicographically first sequence showing at least once the 10 digits. S = 0,517,7,49,36,18,8,64,24,8,32,6,12,2,4,8,32,6,12,2,4,8,32,6,12, 2,4,8,32,6,12,2,4,8,32,6,12,2,4,8,32,6,12, 2,4,8,32,6,12,2,4,8,32,6,12,2,4,8,32,6,12,... Best, É.