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| n | a(n) |
|---|---|
| 20 | 654729075 |
| 21 | 105411381075 |
| 22 | 9729928783575 |
| 23 | 682187321190375 |
| 24 | 40619713503218850 |
| 25 | 2178070341434237250 |
| 26 | 108946451099337101250 |
| 27 | 5201416870471272701250 |
| 28 | 240786076823686096077375 |
| 29 | 10929696310323023478019775 |
| 30 | 490470855046984824670532875 |
| 31 | 21893162839119896036432594875 |
[654729075,105411381075,9729928783575, 682187321190375,40619713503218850, 2178070341434237250,108946451099337101250, 5201416870471272701250,240786076823686096077375, 10929696310323023478019775, 490470855046984824670532875, 21893162839119896036432594875] |