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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 62 |
| 4 | 210 |
| 5 | 2570 |
| 6 | 9198 |
| 7 | 121574 |
| 8 | 6170930 |
| 9 | 23091222 |
| 10 | 1238188770 |
| 11 | 17878237850 |
| 12 | 68186767614 |
| 13 | 998138215286 |
| 14 | 56649051916610 |
| 15 | 3256840408493918 |
| 16 | 12600235023025650 |
| 17 | 734198769102867726 |
| 18 | 11085367330679918342 |
[2,6,62,210,2570,9198,121574,6170930,23091222, 1238188770,17878237850,68186767614,998138215286, 56649051916610,3256840408493918,12600235023025650, 734198769102867726,11085367330679918342] |