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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 88 |
| 10 | 374 |
| 11 | 1596 |
| 12 | 9550 |
| 13 | 53268 |
| 14 | 321912 |
| 15 | 2348995 |
| 16 | 21763014 |
| 17 | 230932203 |
| 18 | 2808007076 |
| 19 | 38499914560 |
| 20 | 608992059466 |
[1,7,19,37,88,374,1596,9550,53268,321912,2348995, 21763014,230932203,2808007076,38499914560, 608992059466] |