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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 2041 |
| 4 | 8801 |
| 5 | 1381757 |
| 6 | 24355253 |
| 7 | 249302027 |
| 8 | 464754407 |
| 9 | 2681233451 |
| 10 | 16488506281 |
| 11 | 16772956369 |
| 12 | 39665616523 |
| 13 | 72966441899 |
| 14 | 168777472279 |
| 15 | 388885239223 |
| 16 | 420953651807 |
| 17 | 2974921088191 |
| 18 | 3487599163841 |
[1,13,2041,8801,1381757,24355253,249302027, 464754407,2681233451,16488506281,16772956369, 39665616523,72966441899,168777472279,388885239223, 420953651807,2974921088191,3487599163841] |