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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 25 |
| 3 | 83 |
| 4 | 274 |
| 5 | 2275 |
| 6 | 132224 |
| 7 | 1060067 |
| 8 | 3312425 |
| 9 | 10997342 |
| 10 | 36304451 |
| 11 | 301432950 |
| 12 | 17519415551 |
| 13 | 140456757358 |
| 14 | 438889687625 |
| 15 | 1457125820233 |
| 16 | 4810267148324 |
| 17 | 39939263006825 |
| 18 | 2321287521544174 |
| 19 | 18610239435360217 |
| 20 | 58152005827624825 |
| 21 | 193066256918234692 |
[1,8,25,83,274,2275,132224,1060067,3312425, 10997342,36304451,301432950,17519415551, 140456757358,438889687625,1457125820233, 4810267148324,39939263006825,2321287521544174, 18610239435360217,58152005827624825, 193066256918234692] |