Given a number > 0, output the sum with all digits (1 .. n) concatenated and reversed and add them up. For example, with n = 6:

The numbers 1 to 6 concatenated:

    123456

Reversed:

    654321

Adding them up together will result in: 777777. Another example is n = 11:

    1 2 3 4 5 6 7 8 9 10 11 > 1234567891011

and

    11 10 9 8 7 6 5 4 3 2 1 > 1110987654321

Adding them up together will result in `2345555545332`. This is also known as [A078262](https://oeis.org/A078262).

Shortest code wins!