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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 10 |
| 4 | 12 |
| 5 | 52 |
| 6 | 188 |
| 7 | 1175 |
| 8 | 4840 |
| 9 | 25168 |
| 10 | 90992 |
| 11 | 896368 |
| 12 | 8164112 |
| 13 | 30997008 |
| 14 | 233151408 |
| 15 | 2111839632 |
[2,3,10,12,52,188,1175,4840,25168,90992,896368, 8164112,30997008,233151408,2111839632] |