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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 153 |
| 11 | 637 |
| 12 | 2331 |
| 13 | 11267 |
| 14 | 74210 |
| 15 | 497308 |
| 16 | 3765392 |
| 17 | 35883138 |
| 18 | 379301928 |
| 19 | 4460755344 |
[1,7,19,37,153,637,2331,11267,74210,497308, 3765392,35883138,379301928,4460755344] |