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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 22 |
| 3 | 212 |
| 4 | 3255 |
| 5 | 70777 |
| 6 | 2022897 |
| 7 | 72375484 |
| 8 | 3130502129 |
| 9 | 159476810183 |
| 10 | 9376968779265 |
| 11 | 626244735454991 |
| 12 | 46892450411406465 |
| 13 | 3894861818247549265 |
| 14 | 355651177699555693544 |
| 15 | 35432761283736539730108 |
[1,4,22,212,3255,70777,2022897,72375484, 3130502129,159476810183,9376968779265, 626244735454991,46892450411406465, 3894861818247549265,355651177699555693544, 35432761283736539730108] |