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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 88 |
| 9 | 676 |
| 10 | 4377 |
| 11 | 23168 |
| 12 | 128083 |
| 13 | 1375195 |
| 14 | 16989531 |
| 15 | 217989023 |
| 16 | 2931139962 |
| 17 | 55566047699 |
| 18 | 1303222849730 |
| 19 | 35399619266821 |
[1,7,19,37,88,676,4377,23168,128083,1375195, 16989531,217989023,2931139962,55566047699, 1303222849730,35399619266821] |