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| n | a(n) |
|---|---|
| 19 | 1 |
| 20 | 25 |
| 21 | 375 |
| 22 | 4439 |
| 23 | 46240 |
| 24 | 449376 |
| 25 | 4226604 |
| 26 | 39474916 |
| 27 | 373382588 |
| 28 | 3635491860 |
| 29 | 36957484104 |
| 30 | 397181210056 |
| 31 | 4560293779650 |
| 32 | 56383382731802 |
| 33 | 754184534296262 |
| 34 | 10926207562498862 |
| 35 | 171119131459887864 |
| 36 | 2885501334257214456 |
| 37 | 52124282589435604908 |
| 38 | 1003403354618592544692 |
[1,25,375,4439,46240,449376,4226604,39474916, 373382588,3635491860,36957484104,397181210056, 4560293779650,56383382731802,754184534296262, 10926207562498862,171119131459887864, 2885501334257214456,52124282589435604908, 1003403354618592544692] |