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