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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 9 |
| 4 | 43 |
| 5 | 185 |
| 6 | 1068 |
| 7 | 5908 |
| 8 | 33711 |
| 9 | 201908 |
| 10 | 1252537 |
| 11 | 8093382 |
| 12 | 54041010 |
| 13 | 367349280 |
| 14 | 2519993244 |
| 15 | 17358556116 |
| 16 | 119812418022 |
[2,9,43,185,1068,5908,33711,201908,1252537, 8093382,54041010,367349280,2519993244,17358556116, 119812418022] |