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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 553 |
| 5 | 14281 |
| 6 | 517681 |
| 7 | 25396561 |
| 8 | 1625662081 |
| 9 | 131681531521 |
| 10 | 13168185811201 |
| 11 | 1593350882323201 |
| 12 | 229442532323558401 |
| 13 | 38775788037405619201 |
| 14 | 7600054456464819148801 |
| 15 | 1710012252722891749632001 |
| 16 | 437763136697374129754112001 |
| 17 | 126513546505546814497787904001 |
[1,1,3,31,553,14281,517681,25396561,1625662081, 131681531521,13168185811201,1593350882323201, 229442532323558401,38775788037405619201, 7600054456464819148801,1710012252722891749632001, 437763136697374129754112001, 126513546505546814497787904001] |