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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 35 |
| 4 | 232 |
| 5 | 1646 |
| 6 | 12239 |
| 7 | 94137 |
| 8 | 742825 |
| 9 | 5980056 |
| 10 | 48922556 |
| 11 | 405553786 |
| 12 | 3399234751 |
| 13 | 28759383055 |
| 14 | 245284421794 |
| 15 | 2106648344723 |
| 16 | 18204169010624 |
| 17 | 158160107826385 |
| 18 | 1380740162723725 |
| 19 | 12105923730466112 |
| 20 | 106553900171498799 |
| 21 | 941167605177271396 |
| 22 | 8339751316507463238 |
[1,1,6,35,232,1646,12239,94137,742825,5980056, 48922556,405553786,3399234751,28759383055, 245284421794,2106648344723,18204169010624, 158160107826385,1380740162723725, 12105923730466112,106553900171498799, 941167605177271396,8339751316507463238] |