2,1

Here, an average array is an array with positive integers such that each number in the array is the average of 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: A262920 A183455 A183340 * A093485 A226633 A156967

Adjacent sequences: A195746 A195747 A195748 * A195750 A195751 A195752

nonn

Kausthub Gudipati, Sep 23 2011

approved