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| n | a(n) |
|---|---|
| 0 | 3125 |
| 1 | 759375 |
| 2 | 9765625 |
| 3 | 52521875 |
| 4 | 184528125 |
| 5 | 503284375 |
| 6 | 1160290625 |
| 7 | 2373046875 |
| 8 | 4437053125 |
| 9 | 7737809375 |
| 10 | 12762815625 |
| 11 | 20113571875 |
| 12 | 30517578125 |
| 13 | 44840334375 |
| 14 | 64097340625 |
| 15 | 89466096875 |
| 16 | 122298103125 |
| 17 | 164130859375 |
| 18 | 216699865625 |
| 19 | 281950621875 |
| 20 | 362050628125 |
| 21 | 459401384375 |
[3125,759375,9765625,52521875,184528125,503284375, 1160290625,2373046875,4437053125,7737809375, 12762815625,20113571875,30517578125,44840334375, 64097340625,89466096875,122298103125,164130859375, 216699865625,281950621875,362050628125, 459401384375] |