The function is : F(n-1) n F(n-1) 

Its a type of palindrome function called Zimmer Series.

The values would be : 1, 121, 1213121, ...

I want to figure the summation of the individual digits. 

1 + (1+2+1) + (1+2+1+3+1+2+1) + ...

Any help is welcome.