%N Smallest possible largest element of an 2 by n average array where repetitions are allowed with no diagonals.
%C Here a 2 by n average array is an array where each number is the average of its horizontal and vertical cells.
%H Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0399.html">Average array</a>
%e For example there are three 2 * 2 average arrays.
%A _Kausthub Gudipati_, Sep 23 2011