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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 6 |
| 2 | 30 |
| 3 | 330 |
| 4 | 5610 |
| 5 | 207570 |
| 6 | 13907190 |
| 7 | 1821841890 |
| 8 | 468213365730 |
| 9 | 243939163545330 |
| 10 | 251501277615235230 |
| 11 | 516332122944077927190 |
| 12 | 2116445371947775423551810 |
| 13 | 17373900058319288451936808290 |
| 14 | 285123073857077842784734960847190 |
[2,6,30,330,5610,207570,13907190,1821841890, 468213365730,243939163545330,251501277615235230, 516332122944077927190,2116445371947775423551810, 17373900058319288451936808290, 285123073857077842784734960847190] |