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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | 15 |
| 5 | 61 |
| 6 | 286 |
| 7 | 1424 |
| 8 | 7603 |
| 9 | 42033 |
| 10 | 242336 |
| 11 | 1419240 |
| 12 | 8348112 |
| 13 | 49281446 |
| 14 | 293296988 |
| 15 | 1761636405 |
| 16 | 10672424994 |
[1,5,15,61,286,1424,7603,42033,242336,1419240, 8348112,49281446,293296988,1761636405,10672424994] |