A165223 - OEIS

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A165223 as a simple table

n	a(n)
1	21
2	217
3	3937
4	1040257
5	1073602561
6	68718821377
7	1125897758834689
8	4951760154835678088235319297
9	1427247692705959880439315947500961989719490561

[21,217,3937,1040257,1073602561,68718821377, 1125897758834689,4951760154835678088235319297, 1427247692705959880439315947500961989719490561]