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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 41 |
| 2 | 1640 |
| 3 | 65600 |
| 4 | 2624000 |
| 5 | 104960000 |
| 6 | 4198400000 |
| 7 | 167936000000 |
| 8 | 6717439999180 |
| 9 | 268697599934400 |
| 10 | 10747903996064820 |
| 11 | 429916159790145600 |
| 12 | 17196646389507936000 |
| 13 | 687865855496401920000 |
| 14 | 27514634216499456000000 |
[1,41,1640,65600,2624000,104960000,4198400000, 167936000000,6717439999180,268697599934400, 10747903996064820,429916159790145600, 17196646389507936000,687865855496401920000, 27514634216499456000000] |