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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 35 |
| 3 | 200 |
| 4 | 1125 |
| 5 | 6250 |
| 6 | 34375 |
| 7 | 187500 |
| 8 | 1015625 |
| 9 | 5468750 |
| 10 | 29296875 |
| 11 | 156250000 |
| 12 | 830078125 |
| 13 | 4394531250 |
| 14 | 23193359375 |
| 15 | 122070312500 |
| 16 | 640869140625 |
| 17 | 3356933593750 |
| 18 | 17547607421875 |
| 19 | 91552734375000 |
| 20 | 476837158203125 |
[1,6,35,200,1125,6250,34375,187500,1015625, 5468750,29296875,156250000,830078125,4394531250, 23193359375,122070312500,640869140625, 3356933593750,17547607421875,91552734375000, 476837158203125] |