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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 2028 |
| 3 | 49471 |
| 4 | 1369929 |
| 5 | 35681883 |
| 6 | 945547378 |
| 7 | 25000646212 |
| 8 | 660597156170 |
| 9 | 17464365749979 |
| 10 | 461623512113494 |
| 11 | 12202233224208515 |
| 12 | 322544923721567414 |
| 13 | 8525895890487351554 |
| 14 | 225367025047699642436 |
| 15 | 5957177684230357360501 |
[81,2028,49471,1369929,35681883,945547378, 25000646212,660597156170,17464365749979, 461623512113494,12202233224208515, 322544923721567414,8525895890487351554, 225367025047699642436,5957177684230357360501] |