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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 19 |
| 6 | 43 |
| 7 | 94 |
| 8 | 494 |
| 9 | 5695 |
| 10 | 45904 |
| 11 | 323395 |
| 12 | 2883082 |
| 13 | 44465095 |
| 14 | 991227125 |
| 15 | 21279544840 |
| 16 | 498763157584 |
| 17 | 15169543858784 |
| 18 | 654635049199556 |
[1,7,19,43,94,494,5695,45904,323395,2883082, 44465095,991227125,21279544840,498763157584, 15169543858784,654635049199556] |