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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 38 |
| 3 | 1648 |
| 4 | 67956 |
| 5 | 2662621 |
| 6 | 102825095 |
| 7 | 3940138931 |
| 8 | 150405053021 |
| 9 | 5729680653464 |
| 10 | 218036689302796 |
| 11 | 8292350386134653 |
| 12 | 315276121028319608 |
| 13 | 11984839981037388864 |
| 14 | 455548467001108257477 |
| 15 | 17314744679135811905542 |
[0,38,1648,67956,2662621,102825095,3940138931, 150405053021,5729680653464,218036689302796, 8292350386134653,315276121028319608, 11984839981037388864,455548467001108257477, 17314744679135811905542] |