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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 35 |
| 3 | 181 |
| 4 | 787 |
| 5 | 3691 |
| 6 | 17186 |
| 7 | 80140 |
| 8 | 371557 |
| 9 | 1727168 |
| 10 | 8029262 |
| 11 | 37322914 |
| 12 | 173454722 |
| 13 | 806192395 |
| 14 | 3747118505 |
| 15 | 17416157794 |
| 16 | 80947567203 |
| 17 | 376233042181 |
| 18 | 1748680549533 |
| 19 | 8127627597041 |
| 20 | 37776086870890 |
| 21 | 175578046352176 |
| 22 | 816062607815767 |
[8,35,181,787,3691,17186,80140,371557,1727168, 8029262,37322914,173454722,806192395,3747118505, 17416157794,80947567203,376233042181, 1748680549533,8127627597041,37776086870890, 175578046352176,816062607815767] |