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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 30 |
| 4 | 85 |
| 5 | 91 |
| 6 | 401 |
| 7 | 1160 |
| 8 | 2338 |
| 9 | 13392 |
| 10 | 31765 |
| 11 | 39040 |
| 12 | 442431 |
| 13 | 667330 |
| 14 | 12260875 |
| 15 | 12882668 |
| 16 | 33163533 |
| 17 | 35682489 |
[1,4,30,85,91,401,1160,2338,13392,31765,39040, 442431,667330,12260875,12882668,33163533,35682489] |