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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 55 |
| 2 | 6765 |
| 3 | 832040 |
| 4 | 102334155 |
| 5 | 12586269025 |
| 6 | 1548008755920 |
| 7 | 190392490709135 |
| 8 | 23416728348467685 |
| 9 | 2880067194370816120 |
| 10 | 354224848179261915075 |
| 11 | 43566776258854844738105 |
| 12 | 5358359254990966640871840 |
| 13 | 659034621587630041982498215 |
| 14 | 81055900096023504197206408605 |
[0,55,6765,832040,102334155,12586269025, 1548008755920,190392490709135,23416728348467685, 2880067194370816120,354224848179261915075, 43566776258854844738105,5358359254990966640871840, 659034621587630041982498215, 81055900096023504197206408605] |