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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 9 |
| 9 | 19 |
| 10 | 33 |
| 11 | 87 |
| 12 | 301 |
| 13 | 1337 |
| 14 | 5927 |
| 15 | 24359 |
| 16 | 118543 |
| 17 | 715115 |
| 18 | 5164241 |
| 19 | 42357883 |
| 20 | 353625469 |
| 21 | 3347092839 |
| 22 | 36905312969 |
| 23 | 482588953149 |
| 24 | 7069762004523 |
| 25 | 114903134718451 |
[1,1,1,1,1,1,3,9,19,33,87,301,1337,5927,24359, 118543,715115,5164241,42357883,353625469, 3347092839,36905312969,482588953149,7069762004523, 114903134718451] |