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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 23 |
| 3 | 85 |
| 4 | 480 |
| 5 | 2780 |
| 6 | 17211 |
| 7 | 102782 |
| 8 | 645484 |
| 9 | 3936420 |
| 10 | 24633252 |
| 11 | 150911826 |
| 12 | 941907715 |
| 13 | 5783836527 |
| 14 | 36025719987 |
| 15 | 221566632164 |
| 16 | 1377925800191 |
| 17 | 8486654284672 |
| 18 | 52714390850462 |
| 19 | 324976079474744 |
| 20 | 2016735929148039 |
| 21 | 12443708121368662 |
| 22 | 77167572875652387 |
| 23 | 476406669588897579 |
[6,23,85,480,2780,17211,102782,645484,3936420, 24633252,150911826,941907715,5783836527, 36025719987,221566632164,1377925800191, 8486654284672,52714390850462,324976079474744, 2016735929148039,12443708121368662, 77167572875652387,476406669588897579] |