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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 7 |
| 5 | 209 |
| 6 | 65 |
| 7 | 2911 |
| 8 | 679 |
| 9 | 4505 |
| 10 | 37829 |
| 11 | 564719 |
| 12 | 87815 |
| 13 | 7865521 |
| 14 | 7338631 |
| 15 | 1460701 |
| 16 | 12776743 |
| 17 | 1525870529 |
| 18 | 158184065 |
| 19 | 21252634831 |
| 20 | 9914489123 |
| 21 | 98670339035 |
| 22 | 276182038859 |
| 23 | 4122901604639 |
| 24 | 320559963815 |
[1,1,5,7,209,65,2911,679,4505,37829,564719,87815, 7865521,7338631,1460701,12776743,1525870529, 158184065,21252634831,9914489123,98670339035, 276182038859,4122901604639,320559963815] |