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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 492 |
| 5 | 202064 |
| 6 | 100202536 |
| 7 | 888531141152 |
| 8 | 8548846756027594 |
| 9 | 1400822035743239844640 |
| 10 | 241149984205773848119833656 |
| 11 | 691305758149247080625180837349904 |
| 12 | 2048332087899166877612856148780183708362 |
| 13 | 99840603982108483679316058344233421388081447648 |
[1,2,24,492,202064,100202536,888531141152, 8548846756027594,1400822035743239844640, 241149984205773848119833656, 691305758149247080625180837349904, 2048332087899166877612856148780183708362, 99840603982108483679316058344233421388081447648] |