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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 136 |
| 4 | 2289 |
| 5 | 42376 |
| 6 | 834336 |
| 7 | 17125354 |
| 8 | 362345361 |
| 9 | 7847250409 |
| 10 | 173103073384 |
| 11 | 3875837737520 |
| 12 | 87857163416064 |
| 13 | 2012268157890524 |
| 14 | 46497242493163450 |
| 15 | 1082614775186919136 |
| 16 | 25374686712458407441 |
| 17 | 598217593341171422090 |
| 18 | 14176230568946364963825 |
[1,9,136,2289,42376,834336,17125354,362345361, 7847250409,173103073384,3875837737520, 87857163416064,2012268157890524,46497242493163450, 1082614775186919136,25374686712458407441, 598217593341171422090,14176230568946364963825] |