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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 144 |
| 3 | 2865 |
| 4 | 63783 |
| 5 | 1520946 |
| 6 | 37989600 |
| 7 | 981163395 |
| 8 | 25989236235 |
| 9 | 702155078427 |
| 10 | 19274174370288 |
| 11 | 536030361923004 |
| 12 | 15071094643290504 |
| 13 | 427685151005699670 |
| 14 | 12233798976412720512 |
| 15 | 352372368517249479735 |
| 16 | 10211166472432551608871 |
| 17 | 297492551409510590947551 |
[1,9,144,2865,63783,1520946,37989600,981163395, 25989236235,702155078427,19274174370288, 536030361923004,15071094643290504, 427685151005699670,12233798976412720512, 352372368517249479735,10211166472432551608871, 297492551409510590947551] |