How would you say this in words?
"The sum, as n ranges from 1 to 24, of 2n-1".
I just see "attachments pending approval", but from what hallsoflvy said, I think you could also say
"the sum from n equals 1 to 24 of 2n-1"
"the sum of 2n-1 from n=1 to 24"
or since n is the only variable:
"the sum of 2n-1 from 1 to 24"
"the sum from 1 to 24 of 2n-1"
Wouldn't get too caught up in the notation as long as you know what it means, then you're fine.
Right, this is probably what I'd say since there's just one variable.
Separate names with a comma.