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| n | a(n) |
|---|---|
| 1 | 121 |
| 2 | 873 |
| 3 | 6225 |
| 4 | 44205 |
| 5 | 312209 |
| 6 | 2195485 |
| 7 | 15376453 |
| 8 | 107305341 |
| 9 | 746401305 |
| 10 | 5176610637 |
| 11 | 35805913289 |
| 12 | 247058995669 |
| 13 | 1700863663801 |
| 14 | 11685223911345 |
| 15 | 80125271642765 |
| 16 | 548435823880377 |
| 17 | 3747645664538313 |
| 18 | 25569088975353613 |
[121,873,6225,44205,312209,2195485,15376453, 107305341,746401305,5176610637,35805913289, 247058995669,1700863663801,11685223911345, 80125271642765,548435823880377,3747645664538313, 25569088975353613] |