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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 59 |
| 5 | 952 |
| 6 | 32411 |
| 7 | 2208945 |
| 8 | 323885934 |
| 9 | 84492757788 |
| 10 | 47354744651060 |
| 11 | 53683376052551785 |
| 12 | 116641756206417848067 |
| 13 | 528882406558326590368278 |
[1,1,7,59,952,32411,2208945,323885934,84492757788, 47354744651060,53683376052551785, 116641756206417848067,528882406558326590368278] |