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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 15 |
| 4 | 16 |
| 5 | 255 |
| 6 | 375 |
| 7 | 495 |
| 8 | 795 |
| 9 | 1469 |
| 10 | 3825 |
| 11 | 9375 |
| 12 | 28125 |
| 13 | 66375 |
| 14 | 67875 |
| 15 | 234375 |
| 16 | 249487 |
| 17 | 286875 |
| 18 | 309375 |
| 19 | 337185 |
| 20 | 450615 |
| 21 | 590625 |
| 22 | 628125 |
| 23 | 1369125 |
| 24 | 2390625 |
| 25 | 2773125 |
| 26 | 2781387 |
| 27 | 3069375 |
| 28 | 3706785 |
| 29 | 4965309 |
| 30 | 5859375 |
| 31 | 12890625 |
| 32 | 13539375 |
| 33 | 26803125 |
| 34 | 39607575 |
| 35 | 62578125 |
[1,4,15,16,255,375,495,795,1469,3825,9375,28125, 66375,67875,234375,249487,286875,309375,337185, 450615,590625,628125,1369125,2390625,2773125, 2781387,3069375,3706785,4965309,5859375,12890625, 13539375,26803125,39607575,62578125] |