Mathcad 15 index summation

Is it possible to to index the summation for odd numbers in 15?

25-Diamond I

Maybe that way:

25-Diamond I

Or you may redefine your function f(..) to return zero for even values of n:

or, as a variation, you may put the branch into the sum instead of the function f:

And as my last solution for now you may do without the summation operator and program the summation yourself:

The last will not work for a=1 unless you add some kind of branch (if).

Author

8-Gravel

I tried to follow the same method in my original programming but the solution does not converge while matlab can

Can you share your views

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