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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 30 |
| 4 | 276 |
| 5 | 3165 |
| 6 | 47521 |
| 7 | 826000 |
| 8 | 16843792 |
| 9 | 387723045 |
| 10 | 10009889889 |
| 11 | 285360865350 |
| 12 | 8918311872516 |
| 13 | 302888304741841 |
| 14 | 11112685595264369 |
| 15 | 437898699063881208 |
| 16 | 18447025862624951488 |
| 17 | 827242515246907227633 |
| 18 | 39346558373191515582161 |
[1,5,30,276,3165,47521,826000,16843792,387723045, 10009889889,285360865350,8918311872516, 302888304741841,11112685595264369, 437898699063881208,18447025862624951488, 827242515246907227633,39346558373191515582161] |