George Washington
James Monroe
Andrew Jackson
James K. Polk
James Buchanan
Andrew Johnson
James A, Garfield
William McKinley
Theodore Roosevelt
William H. Taft
Warren G. Harding
Franklin D. Roosevelt
Harry S. Truman
Lyndon B. Johnson
Gerald R. Ford
That's 15, not 14. :-)
hmmm, I wonder which one I missed, you may want to add one more, Taft was so fat he can be counted as 2.