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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 86 |
| 5 | 1905 |
| 6 | 66002 |
| 7 | 5218373 |
| 8 | 1340847046 |
| 9 | 688750226335 |
| 10 | 527838995308056 |
| 11 | 707409447204872377 |
| 12 | 2844096719471817175298 |
| 13 | 30274246332924074325724393 |
| 14 | 517646331335208169889265781259 |
| 15 | 13363896516779950029547538703868509 |
[1,1,2,7,86,1905,66002,5218373,1340847046, 688750226335,527838995308056,707409447204872377, 2844096719471817175298,30274246332924074325724393, 517646331335208169889265781259, 13363896516779950029547538703868509] |