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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 41 |
| 2 | 1640 |
| 3 | 65600 |
| 4 | 2624000 |
| 5 | 104960000 |
| 6 | 4198400000 |
| 7 | 167936000000 |
| 8 | 6717440000000 |
| 9 | 268697600000000 |
| 10 | 10747904000000000 |
| 11 | 429916160000000000 |
| 12 | 17196646400000000000 |
| 13 | 687865856000000000000 |
| 14 | 27514634240000000000000 |
[1,41,1640,65600,2624000,104960000,4198400000, 167936000000,6717440000000,268697600000000, 10747904000000000,429916160000000000, 17196646400000000000,687865856000000000000, 27514634240000000000000] |