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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 25 |
| 4 | 75 |
| 5 | 175 |
| 6 | 500 |
| 7 | 1125 |
| 8 | 3125 |
| 9 | 6875 |
| 10 | 18750 |
| 11 | 40625 |
| 12 | 109375 |
| 13 | 234375 |
| 14 | 625000 |
| 15 | 1328125 |
| 16 | 3515625 |
| 17 | 7421875 |
| 18 | 19531250 |
| 19 | 41015625 |
| 20 | 107421875 |
| 21 | 224609375 |
| 22 | 585937500 |
| 23 | 1220703125 |
| 24 | 3173828125 |
| 25 | 6591796875 |
| 26 | 17089843750 |
| 27 | 35400390625 |
[1,3,10,25,75,175,500,1125,3125,6875,18750,40625, 109375,234375,625000,1328125,3515625,7421875, 19531250,41015625,107421875,224609375,585937500, 1220703125,3173828125,6591796875,17089843750, 35400390625] |