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| n | a(n) |
|---|---|
| 1 | 9450 |
| 2 | 99225 |
| 3 | 617400 |
| 4 | 3841600 |
| 5 | 17287200 |
| 6 | 77792400 |
| 7 | 280052640 |
| 8 | 1008189504 |
| 9 | 3080579040 |
| 10 | 9412880400 |
| 11 | 25357147200 |
| 12 | 68309049600 |
| 13 | 166503308400 |
| 14 | 405851814225 |
| 15 | 911913952950 |
| 16 | 2048991844900 |
| 17 | 4302882874290 |
| 18 | 9036054036009 |
| 19 | 17922751806960 |
[9450,99225,617400,3841600,17287200,77792400, 280052640,1008189504,3080579040,9412880400, 25357147200,68309049600,166503308400,405851814225, 911913952950,2048991844900,4302882874290, 9036054036009,17922751806960] |