I can appreciate that you want to sound like the song, but by looking at the pattern, or someone showing you, your not really learning.
It might seem hard at first, but my advice is whack the song on an ipod, and put it on repeat for 20 - 30 minutes. shut your eyes and listen. It helps to tap your foot along to the rhythm, and to "fake" strum with your arm. find a motion that feels right and fits with the song. it doesn't matter if its perfect. The point is that you have worked out on your own, how to play the song. The more you do this, the better you will become.
You have to crawl before you can walk. These things take time, and they will come to you. practice practice practice!
But against all I have said, the strum pattern for Mrs. Robinson is :
You can find the chords anywhere.
1 & 2 & 3 & 4 &
D D U U D U