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| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 3372 |
| 3 | 21304 |
| 4 | 136868 |
| 5 | 881432 |
| 6 | 5659548 |
| 7 | 36317408 |
| 8 | 233116252 |
| 9 | 1496407920 |
| 10 | 9605229252 |
| 11 | 61654061624 |
| 12 | 395747083364 |
| 13 | 2540236192136 |
| 14 | 16305351878348 |
| 15 | 104661317077520 |
| 16 | 671803480591468 |
| 17 | 4312194181808480 |
| 18 | 27679252937604244 |
[512,3372,21304,136868,881432,5659548,36317408, 233116252,1496407920,9605229252,61654061624, 395747083364,2540236192136,16305351878348, 104661317077520,671803480591468,4312194181808480, 27679252937604244] |