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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 28 |
| 5 | 98 |
| 6 | 432 |
| 7 | 1846 |
| 8 | 8455 |
| 9 | 38764 |
| 10 | 181840 |
| 11 | 858387 |
| 12 | 4093460 |
| 13 | 19635210 |
| 14 | 94757550 |
[1,3,7,28,98,432,1846,8455,38764,181840,858387, 4093460,19635210,94757550] |