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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 835 |
| 5 | 18216 |
| 6 | 503349 |
| 7 | 16855084 |
| 8 | 663482831 |
| 9 | 30028551760 |
| 10 | 1536446339593 |
| 11 | 87704127028068 |
| 12 | 5525854843477995 |
| 13 | 380920533712670056 |
| 14 | 28518416931490444157 |
| 15 | 2304386381189483726044 |
| 16 | 199888539403801152219271 |
| 17 | 18526504345764539763792576 |
[1,1,5,52,835,18216,503349,16855084,663482831, 30028551760,1536446339593,87704127028068, 5525854843477995,380920533712670056, 28518416931490444157,2304386381189483726044, 199888539403801152219271, 18526504345764539763792576] |