C++

Write a recursive function to RETURN the nth term from the following SERIES { 0, 0.5, 1.5, 3, 5, 7.5 } That is, the 0th term is 0, the 1st term is 0.5. HINT: Only the 0th term is required to handle the base case. The difference between each term depends on the previous RULE EXCEPTION: You may use multiplication operator on the recursive step for this one */ double myseries( unsigned long n );

This is what I have so far:

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double myseries( unsigned long n) //need help with

{

if (n==0)

return 0;

else

return (n + myseries(n-1);)

}