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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 67 |
| 11 | 234 |
| 12 | 1126 |
| 13 | 6422 |
| 14 | 32270 |
| 15 | 161586 |
| 16 | 990365 |
| 17 | 7766402 |
| 18 | 74447984 |
| 19 | 789199485 |
| 20 | 8923308481 |
[1,7,19,37,67,234,1126,6422,32270,161586,990365, 7766402,74447984,789199485,8923308481] |