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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 146 |
| 5 | 1684 |
| 6 | 24294 |
| 7 | 419383 |
| 8 | 8412760 |
| 9 | 192078864 |
| 10 | 4914973770 |
| 11 | 139265564723 |
| 12 | 4327699948956 |
| 13 | 146323675764044 |
| 14 | 5347193667136398 |
| 15 | 210005149832116455 |
| 16 | 8820722263274822992 |
| 17 | 394546588041904397184 |
| 18 | 18723398414958791004690 |
| 19 | 939550079246853331267203 |
[0,1,3,17,146,1684,24294,419383,8412760,192078864, 4914973770,139265564723,4327699948956, 146323675764044,5347193667136398, 210005149832116455,8820722263274822992, 394546588041904397184,18723398414958791004690, 939550079246853331267203] |