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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 41 |
| 5 | 365 |
| 6 | 4429 |
| 7 | 67631 |
| 8 | 1235436 |
| 9 | 26136471 |
| 10 | 626438616 |
| 11 | 16743921605 |
| 12 | 493193891312 |
| 13 | 15860617916787 |
| 14 | 552723118104318 |
| 15 | 20743853592796035 |
| 16 | 834059197889873217 |
| 17 | 35767193981175943493 |
| 18 | 1629529714740523133093 |
| 19 | 78603418440584895849957 |
| 20 | 4002217080821288857968629 |
| 21 | 214514119185341611087477513 |
| 22 | 12073658983251570372687654623 |
[1,1,2,7,41,365,4429,67631,1235436,26136471, 626438616,16743921605,493193891312,15860617916787, 552723118104318,20743853592796035, 834059197889873217,35767193981175943493, 1629529714740523133093,78603418440584895849957, 4002217080821288857968629, 214514119185341611087477513, 12073658983251570372687654623] |