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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 43 |
| 9 | 172 |
| 10 | 775 |
| 11 | 4404 |
| 12 | 27025 |
| 13 | 209013 |
| 14 | 1889445 |
| 15 | 19997883 |
| 16 | 257549066 |
| 17 | 3935142613 |
[1,7,19,43,172,775,4404,27025,209013,1889445, 19997883,257549066,3935142613] |