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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 13 |
| 7 | 37 |
| 8 | 201 |
| 9 | 1391 |
| 10 | 8373 |
| 11 | 61097 |
| 12 | 625360 |
| 13 | 7715937 |
| 14 | 116261530 |
| 15 | 2213148571 |
[1,13,37,201,1391,8373,61097,625360,7715937, 116261530,2213148571] |