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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 25 |
| 3 | 732 |
| 4 | 40681 |
| 5 | 3648990 |
| 6 | 480817681 |
| 7 | 87417943256 |
| 8 | 20966398997041 |
| 9 | 6412838733766170 |
| 10 | 2436104066933508841 |
| 11 | 1125217445576328664692 |
| 12 | 621010503476937955204825 |
| 13 | 403601732164215102065708342 |
[1,2,25,732,40681,3648990,480817681,87417943256, 20966398997041,6412838733766170, 2436104066933508841,1125217445576328664692, 621010503476937955204825, 403601732164215102065708342] |