It is known that SM and Sn respectively represent the sum of the first m terms and the first n terms of the arithmetic sequence {an}, and smsn = m2n2, then aman=______ .

It is known that SM and Sn respectively represent the sum of the first m terms and the first n terms of the arithmetic sequence {an}, and smsn = m2n2, then aman=______ .

In the column of the number of differences, in the order of the number of numbers in the column of the number of differences, the \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\n − 1