Sum of decimal digits of 16^n - 1 = 6*n

[Van Warren]

> 1, 2, 3, 4, 5, 6, 7, 10, 12, 13, 14, 17, 18, 23, 37, 43, 46, 60, 119,
> 183, 223
> Likely, this sequence is finite and there are no other terms.
>
> Does it make sense to add this sequence to OEIS?
>

%K A1234567 ,nonn,finite(21),

- Van