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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 7 |
| 2 | 136 |
| 3 | 30096 |
| 4 | 128231424 |
| 5 | 15917683507200 |
| 6 | 81063451589345280000 |
| 7 | 22675515428700722036736000000 |
| 8 | 449302248871829829537656890982400000000 |
| 9 | 790103237429135552913731284331032467210240000000000 |
[2,7,136,30096,128231424,15917683507200, 81063451589345280000, 22675515428700722036736000000, 449302248871829829537656890982400000000, 79010323742913555291373128433103246721024000000000\ 0] |