2,1

Here, an average array is an array of positive numbers such that each number 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: A004639 A131769 A055832 * A100175 A063489 A299284

Adjacent sequences: A195750 A195751 A195752 * A195754 A195755 A195756

nonn

Kausthub Gudipati, Sep 23 2011

approved