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