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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 149 |
| 5 | 2016 |
| 6 | 34447 |
| 7 | 697264 |
| 8 | 16349769 |
| 9 | 438688000 |
| 10 | 13302715931 |
| 11 | 450127632384 |
| 12 | 16805250091357 |
| 13 | 685963808029696 |
| 14 | 30389466219654375 |
| 15 | 1452343581621354496 |
| 16 | 74484586717220845073 |
| 17 | 4080558161067766972416 |
| 18 | 237830597688699873580339 |
| 19 | 14694357436059217272832000 |
[1,1,3,16,149,2016,34447,697264,16349769, 438688000,13302715931,450127632384,16805250091357, 685963808029696,30389466219654375, 1452343581621354496,74484586717220845073, 4080558161067766972416,237830597688699873580339, 14694357436059217272832000] |