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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 20 |
| 3 | 250 |
| 4 | 3250 |
| 5 | 42500 |
| 6 | 556250 |
| 7 | 7281250 |
| 8 | 95312500 |
| 9 | 1247656250 |
| 10 | 16332031250 |
| 11 | 213789062500 |
| 12 | 2798535156250 |
| 13 | 36633300781250 |
| 14 | 479536132812500 |
| 15 | 6277209472656250 |
| 16 | 82169738769531250 |
| 17 | 1075615844726562500 |
[2,20,250,3250,42500,556250,7281250,95312500, 1247656250,16332031250,213789062500,2798535156250, 36633300781250,479536132812500,6277209472656250, 82169738769531250,1075615844726562500] |