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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 22 |
| 4 | 425 |
| 5 | 11550 |
| 6 | 403252 |
| 7 | 17164532 |
| 8 | 860938920 |
| 9 | 49684113582 |
| 10 | 3240906864140 |
| 11 | 235707022877304 |
| 12 | 18906047682170948 |
| 13 | 1657638292334575486 |
| 14 | 157698852357527675040 |
| 15 | 16177213677228994535040 |
| 16 | 1779883643542856425993296 |
| 17 | 209064002262265290212455374 |
[1,2,22,425,11550,403252,17164532,860938920, 49684113582,3240906864140,235707022877304, 18906047682170948,1657638292334575486, 157698852357527675040,16177213677228994535040, 1779883643542856425993296, 209064002262265290212455374] |