2,1

Here, an average array is an array with positive integers such that every number in that array is the average of its horizontally and vertically adjacent cells.

Table of n, a(n) for n=2..12.

Erich Friedman, Problem of the month March 1999

Sequence in context: A203084 A202378 A202371 * A072607 A306214 A160828

Adjacent sequences: A195748 A195749 A195750 * A195752 A195753 A195754

nonn

Kausthub Gudipati, Sep 23 2011

approved