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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 99 |
| 4 | 6272 |
| 5 | 876725 |
| 6 | 232419936 |
| 7 | 105471170140 |
| 8 | 76095730062464 |
| 9 | 82555139387847312 |
| 10 | 128928209221144677400 |
| 11 | 279860608037771819829980 |
| 12 | 820360089598849358326307904 |
| 13 | 3169977309466844379463315722484 |
[1,4,99,6272,876725,232419936,105471170140, 76095730062464,82555139387847312, 128928209221144677400,279860608037771819829980, 820360089598849358326307904, 3169977309466844379463315722484] |