3,1

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

Table of n, a(n) for n=3..15.

Erich Friedman, Problem of the month March 1999

Sequence in context: A284660 A234781 A045079 * A268578 A268862 A277786

Adjacent sequences: A195808 A195809 A195810 * A195812 A195813 A195814

nonn

Kausthub Gudipati, Sep 24 2011

approved