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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 15 |
| 7 | 1225 |
| 8 | 343000 |
| 9 | 252047376 |
| 10 | 408410100000 |
| 11 | 1291467969000000 |
| 12 | 7281760530523359375 |
| 13 | 68304345527688750390625 |
| 14 | 1009036084126126084036009001 |
| 15 | 22455695662847780324059072265625 |
| 16 | 725747031014354499889356800000000000 |
| 17 | 33031134065402989058412384256000000000000 |
[1,1,15,1225,343000,252047376,408410100000, 1291467969000000,7281760530523359375, 68304345527688750390625, 1009036084126126084036009001, 22455695662847780324059072265625, 725747031014354499889356800000000000, 33031134065402989058412384256000000000000] |