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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 11 |
| 2 | 76 |
| 3 | 654 |
| 4 | 6816 |
| 5 | 83880 |
| 6 | 1193760 |
| 7 | 19318320 |
| 8 | 350622720 |
| 9 | 7056927360 |
| 10 | 156031142400 |
| 11 | 3760042809600 |
| 12 | 98093779660800 |
| 13 | 2754553785984000 |
| 14 | 82841868639129600 |
| 15 | 2656672553703168000 |
| 16 | 90498598469959680000 |
| 17 | 3263440333591646208000 |
[2,11,76,654,6816,83880,1193760,19318320, 350622720,7056927360,156031142400,3760042809600, 98093779660800,2754553785984000,82841868639129600, 2656672553703168000,90498598469959680000, 3263440333591646208000] |