%N Position on a standard U.S. keyboard where the n-th letter of the alphabet can be found.
%H HowStuffWorks, <a href="http://computer.howstuffworks.com/keyboard1.htm">An explanation of why the characters on a keyboard are where they are</a>.
%e a(8)=16 because the 8th letter of the alphabet resides on the 16th key of a standard U.S. keyboard.
%Y Cf. A002252.
%A Christopher M. Tomaszewski (cmt1288(AT)comcast.net), Jul 28 2003