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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 578 |
| 3 | 13442 |
| 4 | 657722 |
| 5 | 8943218 |
| 6 | 130431428 |
| 7 | 1207302502 |
| 8 | 10272615125 |
| 9 | 64849263302 |
| 10 | 384014075750 |
| 11 | 1885027008818 |
| 12 | 8723067515222 |
| 13 | 34924262211422 |
| 14 | 133490468673758 |
| 15 | 458639082931598 |
| 16 | 1515242313469477 |
| 17 | 4594326578653430 |
| 18 | 13491494779735190 |
[2,578,13442,657722,8943218,130431428,1207302502, 10272615125,64849263302,384014075750, 1885027008818,8723067515222,34924262211422, 133490468673758,458639082931598,1515242313469477, 4594326578653430,13491494779735190] |