A095890 Triangle read by rows: T(n,k) = (n-k+1)^(n-k), n>=1, 1<=k<=n.

1, 2, 1, 9, 2, 1, 64, 9, 2, 1, 625, 64, 9, 2, 1, 7776, 625, 64, 9, 2, 1, 117649, 7776, 625, 64, 9, 2, 1, 2097152, 117649, 7776, 625, 64, 9, 2, 1, 43046721, 2097152, 117649, 7776, 625, 64, 9, 2, 1, 1000000000, 43046721, 2097152, 117649, 7776, 625, 64, 9, 2, 1