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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 82 |
| 10 | 361 |
| 11 | 2515 |
| 12 | 15385 |
| 13 | 83649 |
| 14 | 564736 |
| 15 | 5375347 |
| 16 | 66177036 |
| 17 | 879906596 |
| 18 | 12668769870 |
| 19 | 218134701822 |
| 20 | 4684620580146 |
[1,7,19,37,82,361,2515,15385,83649,564736,5375347, 66177036,879906596,12668769870,218134701822, 4684620580146] |