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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 27 |
| 3 | 512 |
| 4 | 9261 |
| 5 | 166375 |
| 6 | 2985984 |
| 7 | 53582633 |
| 8 | 961504803 |
| 9 | 17253512704 |
| 10 | 309601747125 |
| 11 | 5555577996431 |
| 12 | 99690802348032 |
| 13 | 1788878864685457 |
| 14 | 32100128763082731 |
| 15 | 576013438873664000 |
| 16 | 10336141770970357629 |
| 17 | 185474538438612378103 |
[0,1,27,512,9261,166375,2985984,53582633, 961504803,17253512704,309601747125,5555577996431, 99690802348032,1788878864685457,32100128763082731, 576013438873664000,10336141770970357629, 185474538438612378103] |