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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 567 |
| 4 | 67689 |
| 5 | 33887403 |
| 6 | 68921796861 |
| 7 | 563431696713567 |
| 8 | 18451249599365935569 |
| 9 | 2418017680197896730749523 |
| 10 | 1267674779574792745831097365221 |
| 11 | 2658469935859419140387217204140789127 |
| 12 | 22300777100086187451068223319189800258419769 |
[1,3,21,567,67689,33887403,68921796861, 563431696713567,18451249599365935569, 2418017680197896730749523, 1267674779574792745831097365221, 2658469935859419140387217204140789127, 22300777100086187451068223319189800258419769] |