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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1564 |
| 3 | 9647 |
| 4 | 63000 |
| 5 | 412120 |
| 6 | 2668500 |
| 7 | 17280632 |
| 8 | 112196812 |
| 9 | 729345568 |
| 10 | 4730716616 |
| 11 | 30705881416 |
| 12 | 199250972104 |
| 13 | 1294118583944 |
| 14 | 8396039853104 |
| 15 | 54516655728608 |
| 16 | 353723940339776 |
| 17 | 2297049424994128 |
| 18 | 14903574260972720 |
[256,1564,9647,63000,412120,2668500,17280632, 112196812,729345568,4730716616,30705881416, 199250972104,1294118583944,8396039853104, 54516655728608,353723940339776,2297049424994128, 14903574260972720] |