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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 25 |
| 2 | 624 |
| 3 | 15575 |
| 4 | 388751 |
| 5 | 9703200 |
| 6 | 242191249 |
| 7 | 6045078025 |
| 8 | 150884759376 |
| 9 | 3766073906375 |
| 10 | 94000962899999 |
| 11 | 2346257998593600 |
| 12 | 58562449001940001 |
| 13 | 1461714967049906425 |
| 14 | 36484311727245720624 |
| 15 | 910646078214093109175 |
[1,25,624,15575,388751,9703200,242191249, 6045078025,150884759376,3766073906375, 94000962899999,2346257998593600,58562449001940001, 1461714967049906425,36484311727245720624, 910646078214093109175] |