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| n | a(n) |
|---|---|
| 8 | 15 |
| 9 | 4556 |
| 10 | 595764 |
| 11 | 51891168 |
| 12 | 3603845850 |
| 13 | 219232218800 |
| 14 | 12343437685332 |
| 15 | 665813305327044 |
| 16 | 35191072864927561 |
| 17 | 1850193230895670056 |
| 18 | 97757094648403065960 |
| 19 | 5227192945431401497632 |
| 20 | 284228769019752159341076 |
| 21 | 15768105313056755630898144 |
| 22 | 894491576747408847841004040 |
[15,4556,595764,51891168,3603845850,219232218800, 12343437685332,665813305327044,35191072864927561, 1850193230895670056,97757094648403065960, 5227192945431401497632,284228769019752159341076, 15768105313056755630898144, 894491576747408847841004040] |