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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 153 |
| 11 | 637 |
| 12 | 2307 |
| 13 | 11243 |
| 14 | 74510 |
| 15 | 497944 |
| 16 | 3748694 |
| 17 | 35838488 |
| 18 | 378887007 |
| 19 | 4442870787 |
[1,7,19,37,153,637,2307,11243,74510,497944, 3748694,35838488,378887007,4442870787] |