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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1768 |
| 3 | 12441 |
| 4 | 88964 |
| 5 | 636720 |
| 6 | 4539422 |
| 7 | 32392585 |
| 8 | 231168380 |
| 9 | 1651386880 |
| 10 | 11781707484 |
| 11 | 84133281516 |
| 12 | 600305505960 |
| 13 | 4287360280804 |
| 14 | 30589999124616 |
| 15 | 218462455254332 |
| 16 | 1558732440419296 |
| 17 | 11132074626065648 |
| 18 | 79427162629506432 |
[256,1768,12441,88964,636720,4539422,32392585, 231168380,1651386880,11781707484,84133281516, 600305505960,4287360280804,30589999124616, 218462455254332,1558732440419296, 11132074626065648,79427162629506432] |