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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 87 |
| 4 | 1657 |
| 5 | 43833 |
| 6 | 1515903 |
| 7 | 65766991 |
| 8 | 3473600465 |
| 9 | 218310229201 |
| 10 | 16035686850327 |
| 11 | 1356791248984295 |
| 12 | 130660110400259849 |
| 13 | 14177605780945123273 |
| 14 | 1718558016836289502159 |
| 15 | 230999008481288064430879 |
| 16 | 34208659263890939390952225 |
| 17 | 5549763869122023099520756513 |
[1,1,7,87,1657,43833,1515903,65766991,3473600465, 218310229201,16035686850327,1356791248984295, 130660110400259849,14177605780945123273, 1718558016836289502159,230999008481288064430879, 34208659263890939390952225, 5549763869122023099520756513] |