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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 52 |
| 5 | 846 |
| 6 | 28628 |
| 7 | 1928768 |
| 8 | 255610528 |
| 9 | 66822534992 |
| 10 | 34632302913632 |
| 11 | 35711543058158592 |
| 12 | 73426371674544520192 |
| 13 | 301419451958411673103360 |
| 14 | 2472252535617096234970201088 |
| 15 | 40532629372281642451697543062528 |
| 16 | 1328660058258732602631909956943781888 |
[1,2,7,52,846,28628,1928768,255610528,66822534992, 34632302913632,35711543058158592, 73426371674544520192,301419451958411673103360, 2472252535617096234970201088, 40532629372281642451697543062528, 1328660058258732602631909956943781888] |