You can
put this solution on YOUR website!
Is the 3rd term right? "50/2". Surely no mathematician would
leave that unreduced and not write it as 25. That's why I suspect
there is a typo. Check the sequence again. Correct it or say
it's really the unreduced fraction 50/2 in the thank-you note
form below, and I'll get back to you by email.
Edwin