The following neologisms are suggested, but are not widely accepted or used:
as prev.....then
quarce: Four times
quince: Five times
sece (pronounced "sess") or sence: Six times
sepce or septence: Seven times
okce or octence: Eight times
nince or novence: Nine times
dekce or decence: Ten times
elfce: Eleven times
duss: Twelve times
baikce: Thirteen times
Doing something for the 14th time and talking about it is just plain ridiculous!
hmm... I don't think there is a word for "four times" because it's unlikely that someone's would "do something" four times. haha... well that's my thinkin for you, stupid i know. Good question though! :o)