2,1
Here, an average array is an array of positive integers such that each element is the average of the numbers in its horizontally and vertically adjacent cells.
Table of n, a(n) for n=2..15.
Erich Friedman, Problem of the month March 1999
Sequence in context: A066106 A030296 A160171 * A095806 A096872 A123959
Adjacent sequences: A195749 A195750 A195751 * A195753 A195754 A195755
nonn
Kausthub Gudipati, Sep 23 2011
approved