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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 119 |
| 4 | 9152 |
| 5 | 1604067 |
| 6 | 706205768 |
| 7 | 797350288363 |
| 8 | 2355217281173760 |
| 9 | 18388049679475271526 |
| 10 | 382245292023510825419744 |
[0,4,119,9152,1604067,706205768,797350288363, 2355217281173760,18388049679475271526, 382245292023510825419744] |