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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 16 |
| 5 | 125 |
| 6 | 1296 |
| 7 | 15967 |
| 8 | 225184 |
| 9 | 3573369 |
| 10 | 63006400 |
| 11 | 1222037531 |
| 12 | 25856693424 |
| 13 | 592684459237 |
| 14 | 14630486811136 |
| 15 | 386952126342615 |
| 16 | 10916525199478336 |
| 17 | 327220530559545713 |
| 18 | 10385328804324011136 |
| 19 | 347921328910693707955 |
| 20 | 12269256633867840769360 |
[1,1,1,3,16,125,1296,15967,225184,3573369, 63006400,1222037531,25856693424,592684459237, 14630486811136,386952126342615,10916525199478336, 327220530559545713,10385328804324011136, 347921328910693707955,12269256633867840769360] |