| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 27 |
| 6 | 106 |
| 7 | 483 |
| 8 | 2498 |
| 9 | 14487 |
| 10 | 93106 |
| 11 | 657063 |
| 12 | 5051738 |
| 13 | 42033747 |
| 14 | 376353706 |
| 15 | 3608153643 |
| 16 | 36879266978 |
| 17 | 400339173807 |
| 18 | 4599894007906 |
| 19 | 55772890550223 |
| 20 | 711653491362218 |
| 21 | 9532624918010667 |
| 22 | 133746250733151706 |
| 23 | 1961498898620566803 |
[1,1,3,8,27,106,483,2498,14487,93106,657063, 5051738,42033747,376353706,3608153643,36879266978, 400339173807,4599894007906,55772890550223, 711653491362218,9532624918010667, 133746250733151706,1961498898620566803] |