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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 4 |
| 9 | 10 |
| 10 | 45 |
| 11 | 176 |
| 12 | 869 |
| 13 | 4190 |
| 14 | 22684 |
| 15 | 124296 |
| 16 | 729069 |
| 17 | 4981537 |
| 18 | 38867913 |
| 19 | 351596326 |
[1,4,10,45,176,869,4190,22684,124296,729069, 4981537,38867913,351596326] |