[seqfan] Matrix sequence

[franktaw at netscape.net]

What is the permanent of the matrix:

1 2 ... n
n+1 n+2 ... 2n
...
n^2-n+1 n^2-n+2 ... n^2  ?

The sequence appears to start

1,10,450,55128

from n-1; this is not in the database. (These were hand-calculated.)

Franklin T. Adams-Watters