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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 13 |
| 6 | 37 |
| 7 | 100 |
| 8 | 864 |
| 9 | 5014 |
| 10 | 38110 |
| 11 | 471622 |
| 12 | 5596502 |
| 13 | 85749877 |
| 14 | 1841914431 |
| 15 | 44860386415 |
[1,13,37,100,864,5014,38110,471622,5596502, 85749877,1841914431,44860386415] |