| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 55 |
| 4 | 754 |
| 5 | 18853 |
| 6 | 82931 |
| 7 | 70143802 |
| 8 | 11087020614 |
| 9 | 3243227117597 |
| 10 | 1772826333285009 |
| 11 | 1806938280429412270 |
| 12 | 3430002591378184399879 |
| 13 | 12137184871791092506807847 |
| 14 | 80047171080361800628780500638 |
| 15 | 983838070049011459232146327319193 |
[1,2,10,55,754,18853,82931,70143802,11087020614, 3243227117597,1772826333285009, 1806938280429412270,3430002591378184399879, 12137184871791092506807847, 80047171080361800628780500638, 983838070049011459232146327319193] |